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van Bodegraven M, Kröger M, Zamudio Díaz DF, Lohan SB, Moritz RKC, Möller N, Knoblich C, Vogelsang A, Milinic Z, Hallhuber M, Weise JM, Kolbe L, Gallinger J, Graupner C, Klose H, Ulrich C, Meinke MC. Redefine photoprotection: Sun protection beyond sunburn. Exp Dermatol 2024; 33:e15002. [PMID: 38284193 DOI: 10.1111/exd.15002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 10/12/2023] [Accepted: 12/15/2023] [Indexed: 01/30/2024]
Abstract
Excessive exposure to ultraviolet (UV) light leads to acute and chronic UV damage and is the main risk factor for the development of skin cancer. In most countries with western lifestyle, the topical application of sunscreens on UV-exposed skin areas is by far the most frequently used preventive measure against sunburn. Further than preventing sunburns, increasing numbers of consumers are appreciating sunscreens with a medium- to high-level sun protective factor (SPF) as basis for sustainable-skin ageing or skin cancer prevention programs. However, recent investigations indicate that clinically significant DNA damages as well as a lasting impairment of cutaneous immunosurveillance already occur far below the standard of one minimal erythema dose (MED) sunburn level, which contributes to the current discussion of the clinical value of high-protective SPF values. Ex vivo investigations on human skin showed that the application of SPF30 reduces DNA damage for a day long sun exposure (24 MED) drastically by about 53% but is significantly surpassed by SPF100 reducing DNA damage by approx. 73%. Further analysis on different SPF protection levels in UV-exposed cell culture assays focusing on IL-18, cell vitality and cis/trans-urocanic acid support these findings. Whereas SPF30 and SPF50+ sunscreens already offer a solid UVB cover for most indications, our results indicate that SPF100 provides significant additional protection against mutagenic (non-apoptotic-) DNA damage and functional impairment of the cutaneous immunosurveillance and therefore qualifies as an optimized sunscreen for specifically vulnerable patient groups such as immunosuppressed patients, or skin cancer patients.
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Affiliation(s)
| | - Marius Kröger
- Department of Dermatology, Venereology and Allergology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Daniela F Zamudio Díaz
- Department of Dermatology, Venereology and Allergology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Silke B Lohan
- Department of Dermatology, Venereology and Allergology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Rose K C Moritz
- Department of Dermatology, Venereology and Allergology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Nadine Möller
- Research and Development, Beiersdorf AG, Hamburg, Germany
| | | | | | - Zorica Milinic
- Research and Development, Beiersdorf AG, Hamburg, Germany
| | | | - Julia M Weise
- Research and Development, Beiersdorf AG, Hamburg, Germany
| | - Ludger Kolbe
- Research and Development, Beiersdorf AG, Hamburg, Germany
| | | | - Cindy Graupner
- Research and Development, Beiersdorf AG, Hamburg, Germany
| | - Holger Klose
- artMED Private Practice for Plastic and Aesthetic Surgery, Berlin, Germany
| | - Claas Ulrich
- Department of Dermatology, Venereology and Allergology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- CMB Collegium Medicum Berlin GmbH, Berlin, Germany
| | - Martina C Meinke
- Department of Dermatology, Venereology and Allergology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
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Keurentjes AJ, Kezic S, Rustemeyer T, Hulshof CTJ, van der Molen HF. Stimulating Sunscreen Use Among Outdoor Construction Workers: A Pilot Study. Front Public Health 2022; 10:857553. [PMID: 35433569 PMCID: PMC9010717 DOI: 10.3389/fpubh.2022.857553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 02/22/2022] [Indexed: 11/13/2022] Open
Abstract
Background Outdoor workers (OW) receive a higher dose of ultraviolet radiation (UVR) compared to indoor workers (IW) which increases the risk of non-melanoma skin cancer (NMSC). Regular sunscreen use reduces the NMSC risk, however, adequate sun-safety behavior among OW is poor. The main objective was to conduct method- and intervention-related elements of a future intervention trial among OW, based on providing sunscreen and assessing sunscreen use on group- and individual level. Methods This pilot study was conducted at a construction site in the Netherlands from May-August 2021. Nine dispensers with sunscreen (SPF 50+) were installed at the worksite. OW (n = 67) were invited to complete two (cross-sectional) questionnaires on sun-safety behavior, before and after providing sunscreen. Stratum corneum (SC) samples for the assessment of UV-biomarkers were collected from the forehead and behind the ear from 15 OW and 15 IW. The feasibility of the following elements was investigated: recruitment, (loss to) follow-up, outcome measures, data collection, and acceptability of the intervention. Results The first questionnaire was completed by 27 OW, the second by 17 OW. More than 75 percent of the OW were aware of the risks of sun exposure, and 63% (n = 17) found sunscreen use during worktime important. The proportion of OW never applying sunscreen in the past month was 44.4% (n = 12) before, and 35.3% (n = 6) after providing sunscreen. A majority of OW (59.3%, n = 16) found sunscreen provision encouraging for sunscreen use, the dispensers easy to use (64.7%, n = 17) and placed in practical spots (58.8%, n = 18). Collecting SC-samples was fast and easy, and several UV-biomarkers showed higher levels for sun-exposed compared to less exposed body parts. There was no significant difference in UV-biomarker levels between OW and IW. Conclusions This pilot study revealed low sunscreen use among OW despite providing sunscreen, overall satisfaction with the sunscreen, and the sufficient awareness of the risks of UVR-exposure. Collecting SC-samples at the workplace is feasible and several UV-biomarkers showed to be promising in assessing UVR-exposure. The low participation rate and high loss to follow-up poses a challenge for future intervention studies.
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Affiliation(s)
- Anne J. Keurentjes
- Department of Public and Occupational Health, Amsterdam Public Health Research Institute, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- *Correspondence: Anne J. Keurentjes
| | - Sanja Kezic
- Department of Public and Occupational Health, Amsterdam Public Health Research Institute, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Thomas Rustemeyer
- Department of Dermatology and Allergology, Amsterdam University Medical Centers (UMC), Amsterdam, Netherlands
| | - Carel T. J. Hulshof
- Department of Public and Occupational Health, Amsterdam Public Health Research Institute, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Henk F. van der Molen
- Department of Public and Occupational Health, Amsterdam Public Health Research Institute, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
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Allen N, Damian DL. Interventions to Increase Sunscreen Use in Adults: A Review of the Literature. HEALTH EDUCATION & BEHAVIOR 2021; 49:415-423. [PMID: 34636262 DOI: 10.1177/10901981211046534] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Skin cancers are the most common malignancy in Australia. Regular sunscreen use can reduce the incidence of cutaneous squamous cell carcinomas and actinic keratoses and has been associated with reducing the incidence of basal cell carcinomas and melanomas. However, sunscreen effectiveness is limited by the failure of the population to use it routinely. Interventions that promote the daily application of sunscreen may reduce the morbidity, mortality, and economic burden associated with skin malignancies. We reviewed the literature that examines the effectiveness of interventions to increase routine sunscreen use and found that no one strategy has been shown to be clearly effective in adults and that relatively few studies have aimed to increase routine use in groups at extreme skin cancer risk. Future research should consider how interventions can be best designed and how sunscreen use is measured so that cost-effective, feasible strategies that result in improved sunscreen use in adults can be established.
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Affiliation(s)
- Nicholas Allen
- Royal Prince Alfred Hospital, Sydney, New South Wales, Australia.,University of Sydney, Sydney, New South Wales, Australia
| | - Diona L Damian
- Royal Prince Alfred Hospital, Sydney, New South Wales, Australia.,University of Sydney, Sydney, New South Wales, Australia.,Melanoma Institute Australia, Sydney, New South Wales, Australia
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Keurentjes AJ, Jakasa I, van Dijk A, van Putten E, Brans R, John SM, Rustemeyer T, van der Molen HF, Kezic S. Stratum corneum biomarkers after in vivo repeated exposure to sub-erythemal dosages of ultraviolet radiation in unprotected and sunscreen (SPF 50+) protected skin. PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE 2021; 38:60-68. [PMID: 34278599 DOI: 10.1111/phpp.12717] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 06/16/2021] [Accepted: 07/04/2021] [Indexed: 02/06/2023]
Abstract
BACKGROUND There is a need for non-invasive biomarkers to assess in vivo efficacy of protective measures aiming at reducing ultraviolet radiation (UVR) exposure. Stratum corneum (SC) biomarkers showed to be promising markers for internal UVR dose and immune response. PURPOSE To establish a dose-response relationship for SC biomarkers and explore their suitability for in vivo assessment of the blocking effect of two sunscreens with a high sun protection factor (SPF) (50+). METHODS Twelve volunteers were exposed to a broad-spectrum UVB (280-320 nm), five times a week, during one week. Unprotected back skin was irradiated with 0.24, 0.48, 0.72 and 1.44 standard erythema dose (SED) and sunscreen-protected skin with 3.6 SED. SC samples for determination of the relative amount of cis-urocanic acid (cUCA) and thirteen immunological makers including cytokines and matrix metalloproteinases (MMP) were collected after each irradiation. RESULTS cUCA sharply increased after the first irradiation in a dose-dependent fashion. However, it levelled-off after subsequent exposures and reached a plateau for the highest UV-dose after the third irradiation. None of the immunological markers showed dose-dependency. However, MMP-9, IL-1β and CCL27 increased gradually from baseline during repetitive exposures to the highest UV-dose. Assessed from cUCA, both sunscreens blocked >98% of the applied UV-dose. CONCLUSIONS cUCA is a sensitive, non-invasive marker of the internal UVR dose enabling in vivo assessment of the blocking effect of high SPF sunscreens in the UVB-region. Immunological SC markers show low sensitivity in detecting immune response at sub-erythemal UVR dosages, suggesting they might be suitable only at higher and/or repetitive UVR exposure.
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Affiliation(s)
- Anne Josephine Keurentjes
- Department of Public and Occupational Health, Amsterdam UMC, University of Amsterdam, Amsterdam Public Health research institute, Amsterdam, The Netherlands
| | - Ivone Jakasa
- Department of Chemistry and Biochemistry, Laboratory for Analytical Chemistry, Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
| | - Arjan van Dijk
- Center for Environmental Safety and Security, National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands
| | - Edith van Putten
- Center for Environmental Safety and Security, National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands
| | - Richard Brans
- Department of Dermatology, Environmental Medicine and Health Theory, University of Osnabrück, Osnabrück, Germany.,Institute for Interdisciplinary Dermatological Prevention and Rehabilitation (iDerm) at the University of Osnabrück, Osnabrück, Germany
| | - Swen Malte John
- Department of Dermatology, Environmental Medicine and Health Theory, University of Osnabrück, Osnabrück, Germany.,Institute for Interdisciplinary Dermatological Prevention and Rehabilitation (iDerm) at the University of Osnabrück, Osnabrück, Germany
| | - Thomas Rustemeyer
- Department of Dermatology and Allergology, Amsterdam UMC, Amsterdam, The Netherlands
| | - Henk F van der Molen
- Department of Public and Occupational Health, Amsterdam UMC, University of Amsterdam, Amsterdam Public Health research institute, Amsterdam, The Netherlands
| | - Sanja Kezic
- Department of Public and Occupational Health, Amsterdam UMC, University of Amsterdam, Amsterdam Public Health research institute, Amsterdam, The Netherlands
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Keurentjes AJ, Kezic S, Rustemeyer T, Hulshof CTJ, van der Molen HF. Protection Against Solar Ultraviolet Radiation in Outdoor Construction Workers: Study Protocol for a Non-randomized Controlled Intervention Study. Front Public Health 2021; 9:602933. [PMID: 33748058 PMCID: PMC7969508 DOI: 10.3389/fpubh.2021.602933] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 02/10/2021] [Indexed: 01/18/2023] Open
Abstract
Introduction: Non-melanoma skin cancer (NMSC) incidence is increasing, and occupational solar exposure contributes greatly to the overall lifetime ultraviolet radiation (UVR) dose. This is reflected in an excess risk of NMSC showing up to three-fold increase in outdoor workers. Risk of NMSC can be reduced if appropriate measures to reduce UVR-exposure are taken. Regular use of sunscreens showed reduced risk of NMSC. However, sun-safety behavior in outdoor workers is poor. The objective of this study is to investigate the effectiveness of an intervention aiming at increasing sunscreen use by construction workers. Methods: This non-randomized controlled intervention study is comprised of two intervention and two control groups recruited at four different construction sites in the Netherlands. The study population comprises ~200 construction workers, aged 18 years or older, followed during 12 weeks. The intervention consists of providing dispensers with sunscreens (SPF 50+) at construction sites and regular feedback on the application achieved by continuous electronic monitoring. All groups will receive basic information on UV-exposure and skin protection. Stratum corneum (SC) samples will be collected for measurement of biomarkers to assess internal UV-dose. External UV-dose will be assessed by personal UV-sensors worn by the workers during work-shifts in both groups. To detect presence of actinic keratosis (AK) or NMSC, a skin check of body parts exposed to the sun will be performed at the end of the study. The effect of the intervention will be assessed from data on self-reported sunscreen use by means of questionnaires collected on baseline and after 12 weeks of intervention (primary outcome). Levels of SC biomarkers of internal UV-dose, external UV-dose, number of sunburn episodes, and prevalence of NMSC including AK will be assessed as secondary outcomes. The electronically monitored sunscreen consumption will be assessed as process outcome. Discussion: This study is intended to provide evidence of the effectiveness of a technology-driven intervention to increase sunscreen use in outdoor construction workers. Furthermore, it will increase insight in the UV-protective behavior, external and internal UV-exposure, and the prevalence of NMSC, including AK, in construction workers. Trial Registration: The Netherlands Trial Register (NTR): NL8462 Registered on March 19, 2020.
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Affiliation(s)
- Anne J Keurentjes
- Amsterdam University Medical Centers, University of Amsterdam, Department of Public and Occupational Health, Amsterdam Public Health Research Institute, Amsterdam, Netherlands
| | - Sanja Kezic
- Amsterdam University Medical Centers, University of Amsterdam, Department of Public and Occupational Health, Amsterdam Public Health Research Institute, Amsterdam, Netherlands
| | - Thomas Rustemeyer
- Department of Dermatology and Allergology, Amsterdam University Medical Centers, Amsterdam, Netherlands
| | - Carel T J Hulshof
- Amsterdam University Medical Centers, University of Amsterdam, Department of Public and Occupational Health, Amsterdam Public Health Research Institute, Amsterdam, Netherlands
| | - Henk F van der Molen
- Amsterdam University Medical Centers, University of Amsterdam, Department of Public and Occupational Health, Amsterdam Public Health Research Institute, Amsterdam, Netherlands
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Chambergo-Michilot D, Tellez WA, Becerra-Chauca N, Zafra-Tanaka JH, Taype-Rondan A. Text message reminders for improving sun protection habits: A systematic review. PLoS One 2020; 15:e0233220. [PMID: 32428021 PMCID: PMC7236986 DOI: 10.1371/journal.pone.0233220] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 04/30/2020] [Indexed: 12/11/2022] Open
Abstract
Background Excessive exposure to ultraviolet radiation increases the risk of skin cancer and other conditions. SMS text reminders may be a useful tool to improve sun protection habits due to its massive reach, low cost, and accessibility. Objective To perform a systematic review of randomized controlled trials (RCTs) that evaluated the effects of SMS text reminders in promoting sun protection habits. Methods We performed a systematic search in PubMed, Central Cochrane Library, and Scopus; following the PRISMA recommendations to perform systematic reviews. We included RCTs published up to December 2018, which evaluated the benefits and harms of SMS text reminders to improve sun protection habits. Random-effects meta-analyses were performed whenever possible. The certainty of the evidence was assessed for RCTs estimates using the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) methodology. The study protocol was registered in PROSPERO (CRD42018091661). Results Five RCTs were included in this review. When pooled, the studies found no effect of SMS text reminders in “sunburn anytime during follow-up” (two studies, risk ratio: 0.93; 95% confidence interval: 0.83–1.05). Contradictory results were obtained for sunscreen use (three RCTs) and sun protection habits (two RCTs), however, they could not be meta-analyzed because outcomes were measured differently across studies. The certainty of the evidence was very low for these three outcomes according to GRADE methodology. Conclusions RCTs that assessed effects of SMS text reminders did not find a significant benefit on objective outcomes, such as having a sunburn, sunscreen use and composite score of sun protection habits. Since certainty of the evidence was very low, future high-quality studies are needed to reach a conclusion regarding the balance of desirable and undesirable outcomes. Protocol registration number PROSPERO (CRD42018091661).
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Affiliation(s)
| | | | - Naysha Becerra-Chauca
- Instituto de Evaluación de Tecnologías en Salud e Investigación—IETSI, EsSalud, Lima, Perú
| | | | - Alvaro Taype-Rondan
- Universidad San Ignacio de Loyola, Unidad de Investigación para la Generación y Síntesis de Evidencias en Salud, Lima, Peru
- * E-mail:
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Ludewig M, Rocholl M, John SM, Wilke A. Secondary prevention of UV-induced skin cancer: development and pilot testing of an educational patient counseling approach for individual sun protection as standard procedure of patient care. Int Arch Occup Environ Health 2020; 93:765-777. [PMID: 32162123 PMCID: PMC7320965 DOI: 10.1007/s00420-020-01532-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Accepted: 02/23/2020] [Indexed: 01/07/2023]
Abstract
Objective To outline the development and pilot testing of a patient counseling approach for individual sun protection for patients in outdoor professions diagnosed with squamous cell carcinoma or multiple actinic keratosis due to solar UV radiation. This is a secondary prevention measure as part of the standard procedure of patient care by the respective statutory accident insurance. Methods Results of guideline-based qualitative interviews with seven outdoor workers and a search of literature formed the basis for the counseling approach, which was compiled in a manual. Interdisciplinary experts (dermatologists and educators) reviewed and consented the final manual. The pilot testing was conducted in consecutive steps (N1 = 36 patients and N1 = 2 counselors; N4 = 12 patients and N4 = 6 counselors). The first two stages of the revised guideline ‘Criteria for Reporting the Development and Evaluation of Complex Interventions in healthcare (CReDECI 2)’ serve as background and structure for presenting the results. Results The ‘counseling approach for individual sun protection (ILB: Individuelle Lichtschutz-Beratung)’ consists of seven general and eight add-on modules. These can be combined and tailored according to the patient’s individual needs. Interactive, educational components (e.g. haptic experiments) are crucial elements of the counseling approach. Conclusions The special requirements of outdoor workers are hardly taken into consideration in Germany, even though the interest for an improved sun protection behavior of some occupational groups is high. The advantage of the presented approach is that the heterogeneous needs of patients can be specifically addressed with its various modules.
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Affiliation(s)
- Michaela Ludewig
- Department of Dermatology, Environmental Medicine and Health Theory, Institute for Health Research and Education, University of Osnabrück, Osnabrück, Germany. .,Institute for Interdisciplinary Prevention and Rehabilitation at the University of Osnabrück, Osnabrück, Germany.
| | - Marc Rocholl
- Department of Dermatology, Environmental Medicine and Health Theory, Institute for Health Research and Education, University of Osnabrück, Osnabrück, Germany.,Institute for Interdisciplinary Prevention and Rehabilitation at the University of Osnabrück, Osnabrück, Germany
| | - Swen Malte John
- Department of Dermatology, Environmental Medicine and Health Theory, Institute for Health Research and Education, University of Osnabrück, Osnabrück, Germany.,Institute for Interdisciplinary Prevention and Rehabilitation at the University of Osnabrück, Osnabrück, Germany
| | - Annika Wilke
- Department of Dermatology, Environmental Medicine and Health Theory, Institute for Health Research and Education, University of Osnabrück, Osnabrück, Germany.,Institute for Interdisciplinary Prevention and Rehabilitation at the University of Osnabrück, Osnabrück, Germany
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Ziehfreund S, Schuster B, Zink A. Primary prevention of keratinocyte carcinoma among outdoor workers, the general population and medical professionals: a systematic review updated for 2019. J Eur Acad Dermatol Venereol 2019; 33:1477-1495. [PMID: 30801774 DOI: 10.1111/jdv.15525] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 01/29/2019] [Indexed: 02/07/2023]
Abstract
Worldwide 2-3 million cases of keratinocyte carcinoma (KC) are diagnosed annually. Sun-related knowledge is essential for adequate protection against solar ultraviolet radiation (UVR), the main risk factor for KC. The goal was (i) to provide an updated overview of primary prevention against KC including skin cancer-related knowledge, attitudes and sun protection behaviour (SPB) of outdoor workers, the general population and medical professionals as well as (ii) to evaluate the effectiveness and acceptability of sun protection programmes. We conducted a systematic review of articles indexed for MEDLINE on PubMed using selected MeSH terms and keywords related to the studied topic as well as an extensive hand search of publications between 1 January 2012 and 31 December 2018. We identified 51 relevant cross-sectional studies and 22 interventional studies. Sun-related knowledge and attitude showed substantial differences with some alarming results, including people who had not even heard about skin cancer before. Reported SPB varied enormously between the included studies, with none of the studies providing an overall sufficient SPB in their examined sun protection measures. However, sun protection programmes using new technologies seem to have great potential to increase sun-related knowledge and SPB. In countries worldwide, particularly in those where KC is not yet a public health issue, UVR protection should be promoted by healthcare institutions and authorities, politicians, cancer foundations and dermatologists to increase awareness as well as SPB and to decrease the worldwide burden of KC.
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Affiliation(s)
- S Ziehfreund
- Department of Dermatology and Allergy, Technical University of Munich, Munich, Germany
| | - B Schuster
- Department of Dermatology and Allergy, Technical University of Munich, Munich, Germany
| | - A Zink
- Department of Dermatology and Allergy, Technical University of Munich, Munich, Germany
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