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Kim D, Shin Y, Kim EH, Lee Y, Kim S, Kim HS, Kim HC, Leem JH, Kim HR, Bae ON. Functional and dynamic mitochondrial damage by chloromethylisothiazolinone/methylisothiazolinone (CMIT/MIT) mixture in brain endothelial cell lines and rat cerebrovascular endothelium. Toxicol Lett 2022; 366:45-57. [PMID: 35803525 DOI: 10.1016/j.toxlet.2022.06.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 06/27/2022] [Accepted: 06/29/2022] [Indexed: 12/23/2022]
Abstract
The mixture of 5-chloro-2-methyl-4-isothiazolin-3-one (CMIT, chloromethylisothiazolinone) and 2-methyl-4-isothiazolin-3-one (MIT, methylisothiazolinone) is a commonly used biocide in consumer products. Despite the health issues related to its usage in cosmetics and humidifier disinfectants (HD), understanding its adverse outcome is still limited. Using in vitro cell lines and ex vivo rat models, we examined the effects of CMIT/MIT on the cellular redox homeostasis and energy metabolism in the brain microvascular endothelium, a highly restrictive interface between the bloodstream and brain. In murine bEND.3 and human hCMEC/D3, CMIT/MIT significantly amplified the mitochondrial-derived oxidative stress causing disruption of the mitochondrial membrane potential and oxidative phosphorylation at a sub-lethal concentration (1 μg/mL) or treatment duration (1 h). In addition, CMIT/MIT significantly increased a dynamic imbalance between mitochondrial fission and fusion, and endogenous pathological stressors significantly potentiated the CMIT/MIT-induced endothelial dysfunction. Notably, in the brain endothelium isolated from intravenously CMIT/MIT-administered rats, we observed significant mitochondrial damage and decreased tight junction protein. Taken together, we report that CMIT/MIT significantly impaired mitochondrial function and dynamics resulting in endothelial barrier dysfunction, giving an insight into the role of mitochondrial damage in CMIT/MIT-associated systemic health effects.
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Affiliation(s)
- Donghyun Kim
- College of Pharmacy Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, South Korea
| | - Yusun Shin
- College of Pharmacy Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, South Korea
| | - Eun-Hye Kim
- College of Pharmacy Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, South Korea
| | - Youngmee Lee
- Humidifier Disinfectant Health Center, National Institute of Environmental Research, Incheon, South Korea
| | - Seongmi Kim
- Humidifier Disinfectant Health Center, National Institute of Environmental Research, Incheon, South Korea
| | - Hyung Sik Kim
- Division of Toxicology, School of Pharmacy, Sungkyunkwan University, Suwon, South Korea
| | - Hwan-Cheol Kim
- Department of Occupational and Environmental Medicine, Inha University, Incheon, South Korea
| | - Jong-Han Leem
- Department of Occupational and Environmental Medicine, Inha University, Incheon, South Korea
| | - Ha Ryong Kim
- College of Pharmacy, Daegu Catholic University, Daegu, South Korea
| | - Ok-Nam Bae
- College of Pharmacy Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, South Korea.
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Hu SC, Min S, Kang HK, Yang DJ, Lewis SM, Davis KJ, Patton RE, Bryant MS, Sepehr E, Trbojevich R, Pearce MG, Bishop ME, Heflich RH, Maisha MP, Felton R, Chemerynski S, Yee SB, Coraggio M, Rosenfeldt H, Yeager RP, Howard PC, Tang Y. 14-Day Nose-Only Inhalation Toxicity and Haber's Rule Study of NNK in Sprague-Dawley Rats. Toxicol Sci 2021; 183:319-337. [PMID: 34329464 DOI: 10.1093/toxsci/kfab094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) is one of the key tobacco-specific nitrosamines that plays an important role in human lung carcinogenesis. However, repeated inhalation toxicity data on NNK, which is more directly relevant to cigarette smoking, are currently limited. In the present study, the subacute inhalation toxicity of NNK was evaluated in Sprague Dawley rats. Both sexes (9-10 weeks age; 16 rats/sex/group) were exposed by nose-only inhalation to air, vehicle control (75% propylene glycol), or 0.8, 3.2, 12.5, or 50 mg/kg body weight (BW)/day of NNK (NNK aerosol concentrations: 0, 0, 0.03, 0.11, 0.41, or 1.65 mg/L air) for 1 hour/day for 14 consecutive days. Toxicity was evaluated by assessing body and organ weights; food consumption; clinical pathology; histopathology observations; blood, urine, and tissue levels of NNK, its major metabolite 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL), and their glucuronides (reported as total NNK, tNNK, and total NNAL, tNNAL, respectively); O6-methylguanine DNA adduct formation; and blood and bone marrow micronucleus frequency. Whether the subacute inhalation toxicity of NNK followed Haber's Rule was also determined using additional animals exposed 4 hours/day. The results showed that NNK exposure caused multiple significant adverse effects, with the most sensitive endpoint being non-neoplastic histopathological lesions in the nose. The lowest-observed-adverse-effect level (LOAEL) was 0.8 mg/kg BW/day or 0.03 mg/L air for 1 hour/day for both sexes. An assessment of Haber's Rule indicated that 14-day inhalation exposure to the same dose at a lower concentration of NNK aerosol for a longer time (4 hours daily) resulted in greater adverse effects than exposure to a higher concentration of NNK aerosol for a shorter time (1 hour daily).
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Affiliation(s)
- Shu-Chieh Hu
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Seonggi Min
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Hyun-Ki Kang
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Dong-Jin Yang
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Sherry M Lewis
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Kelly J Davis
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, AR
| | - Ralph E Patton
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, AR
| | - Matthew S Bryant
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Estatira Sepehr
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Raul Trbojevich
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Mason G Pearce
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Michelle E Bishop
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Robert H Heflich
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - MacKean P Maisha
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Robert Felton
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Susan Chemerynski
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD
| | - Steven B Yee
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD
| | - Melis Coraggio
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD
| | - Hans Rosenfeldt
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD
| | - R Philip Yeager
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD
| | - Paul C Howard
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Yunan Tang
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
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van Dijk J, Gustavsson M, Dekker SC, van Wezel AP. Towards 'one substance - one assessment': An analysis of EU chemical registration and aquatic risk assessment frameworks. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 280:111692. [PMID: 33293165 DOI: 10.1016/j.jenvman.2020.111692] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 10/05/2020] [Accepted: 11/16/2020] [Indexed: 06/12/2023]
Abstract
With the Green Deal the EU aims to achieve a circular economy, restore biodiversity and reduce environmental pollution. As a part of the Green Deal a 'one-substance one-assessment' (OS-OA) approach for chemicals has been proposed. The registration and risk assessment of chemicals on the European market is currently fragmented across different legal frameworks, dependent on the chemical's use. In this review, we analysed the five main European chemical registration frameworks and their risk assessment procedures for the freshwater environment, covering 1) medicines for human use, 2) veterinary medicines, 3) pesticides, 4) biocides and 5) industrial chemicals. Overall, the function of the current frameworks is similar, but important differences exist between the frameworks' environmental protection goals and risk assessment strategies. These differences result in inconsistent assessment outcomes for similar chemicals. Chemicals are also registered under multiple frameworks due to their multiple uses, and chemicals which are not approved under one framework are in some instances allowed on the market under other frameworks. In contrast, an OS-OA will require a uniform hazard assessment between all different frameworks. In addition, we show that across frameworks the industrial chemicals are the least hazardous for the freshwater environment (median PNEC of 2.60E-2 mg/L), whilst biocides are the most toxic following current regulatory assessment schemes (median PNEC of 1.82E-4 mg/L). Finally, in order to facilitate a successful move towards a OS-OA approach we recommend a) harmonisation of environmental protection goals and risk assessment strategies, b) that emission, use and production data should be made publicly available and that data sharing becomes a priority, and c) an alignment of the criteria used to classify problematic substances.
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Affiliation(s)
- Joanke van Dijk
- Copernicus Institute of Sustainable Development, Utrecht University, Princetonlaan 8a, CB, Utrecht, 3584, the Netherlands.
| | - Mikael Gustavsson
- Department of Mathematical Sciences, Chalmers University of Technology, Gothenburg, SE-412 96, Sweden
| | - Stefan C Dekker
- Copernicus Institute of Sustainable Development, Utrecht University, Princetonlaan 8a, CB, Utrecht, 3584, the Netherlands
| | - Annemarie P van Wezel
- Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Sciencepark 904, XH Amsterdam, 1098, the Netherlands
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Focus on Chronic Exposure for Deriving Drinking Water Guidance Underestimates Potential Risk to Infants. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018. [PMID: 29538282 PMCID: PMC5877057 DOI: 10.3390/ijerph15030512] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In 2007, the Minnesota Department of Health (MDH) developed new risk assessment methods for deriving human health-based water guidance (HBG) that incorporated the assessment of multiple exposure durations and life stages. The methodology is based on US Environmental Protection Agency recommendations for protecting children's health (US EPA 2002). Over the last 10 years, the MDH has derived multiple duration (e.g., short-term, subchronic, and chronic) water guidance for over 60 chemicals. This effort involved derivation of multiple duration reference doses (RfDs) and selection of corresponding water intake rates (e.g., infant, child, and lifetime). As expected, RfDs typically decreased with increasing exposure duration. However, the corresponding HBG frequently did not decrease with increasing duration. For more than half of the chemicals, the shorter duration HBG was lower than chronic HBG value. Conventional wisdom has been that chronic-based values will be the most conservative and will therefore be protective of less than chronic exposures. However, the MDH's experience highlights the importance of evaluating short-term exposures. For many chemicals, elevated intake rates early in life, coupled with short-term RfDs, resulted in the lowest HBG. Drinking water criteria based on chronic assessments may not be protective of short-term exposures in highly exposed populations such as formula-fed infants.
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Gustavsson MB, Hellohf A, Backhaus T. Evaluating the environmental hazard of industrial chemicals from data collected during the REACH registration process. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 586:658-665. [PMID: 28237462 DOI: 10.1016/j.scitotenv.2017.02.039] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 02/04/2017] [Accepted: 02/05/2017] [Indexed: 06/06/2023]
Abstract
Registration dossiers for 11,678 industrial chemicals were retrieved from the database of the European Chemicals Agency, of which 3566 provided a numerical entry for the corresponding predicted no effect concentration for the freshwater environment (PNEC). A distribution-based examination of 2244 of these entries reveals that the average PNEC of an industrial chemical in Europe is 238nmol/L, covering a span of 9 orders of magnitude. A comparison with biocides, pesticides, pharmaceuticals and WFD-priority pollutants reveals that, in average, industrial chemicals are least hazardous (hazard ranking: industrial chemicals≪pharmaceuticals<pesticides<Water Framework Directive priority pollutants<biocides). However, 280 industrial chemicals have a lower environmental threshold than the median pesticide and 73 have a lower environmental threshold than even the median biocide. Industrial chemicals produced and/or imported in higher tonnages have, on average, higher PNECs which most likely is due to the lower assessment factors used for the PNEC determination. This pattern indicates that the initial AF of 1000 comprises a measure of conservatism. The vast majority of PNEC values are driven by EC50 and NOEC data from tests with Daphnia magna. Tests with marine species are rarely provided for the hazard characterization of industrial chemicals.
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Affiliation(s)
- Mikael B Gustavsson
- University of Gothenburg, Department of Biological and Environmental Sciences, PO Box 461, SE 405 30 Göteborg, Sweden.
| | - Andreas Hellohf
- University of Gothenburg, Department of Biological and Environmental Sciences, PO Box 461, SE 405 30 Göteborg, Sweden
| | - Thomas Backhaus
- University of Gothenburg, Department of Biological and Environmental Sciences, PO Box 461, SE 405 30 Göteborg, Sweden
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Verma V, Yu QJ, Connell DW. A comparison of Reduced Life Expectancy (RLE) model with Haber's Rule to describe effects of exposure time on toxicity. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2015; 204:26-31. [PMID: 25898234 DOI: 10.1016/j.envpol.2015.04.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 03/29/2015] [Accepted: 04/09/2015] [Indexed: 06/04/2023]
Abstract
The Reduced Life Expectancy (RLE) Model (LC50 = [ln(NLE) - ln(LT50)]/d) has been proposed as an alternative to Haber's Rule. The model is based on a linear relationship between LC50 (Lethal Exposure Concentration) and lnLT50 (Lethal Exposure Time) and uses NLE (Normal Life Expectancy) as a limiting point as well as a long term data point (where d is a constant). The purposes of this paper were to compare the RLE Model with Haber's Rule with available toxicity data and to evaluate the strengths and weaknesses of each approach. When LT50 is relatively short and LC50 is high, Haber's Rule is consistent with the RLE model. But the difference between the two was evident in the situation when LT50 is relatively long and LC50 is low where the RLE model is a marked departure from Haber's Rule. The RLE Model can be used to appropriately evaluate long term effects of exposure.
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Affiliation(s)
- Vibha Verma
- Griffith School of Engineering, Griffith University, Nathan Campus, Brisbane, Queensland 4111, Australia.
| | - Qiming J Yu
- Griffith School of Engineering, Griffith University, Nathan Campus, Brisbane, Queensland 4111, Australia
| | - Des W Connell
- Griffith School of Engineering, Griffith University, Nathan Campus, Brisbane, Queensland 4111, Australia
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Dieter HH. Health related guide values for drinking-water since 1993 as guidance to assess presence of new analytes in drinking-water. Int J Hyg Environ Health 2014; 217:117-32. [DOI: 10.1016/j.ijheh.2013.05.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Revised: 05/09/2013] [Accepted: 05/27/2013] [Indexed: 10/26/2022]
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Schneider U. Issues to consider in the derivation of water quality benchmarks for the protection of aquatic life. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2014; 21:33-50. [PMID: 24122266 DOI: 10.1007/s11356-013-2204-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Accepted: 09/30/2013] [Indexed: 06/02/2023]
Abstract
While water quality benchmarks for the protection of aquatic life have been in use in some jurisdictions for several decades (USA, Canada, several European countries), more and more countries are now setting up their own national water quality benchmark development programs. In doing so, they either adopt an existing method from another jurisdiction, update on an existing approach, or develop their own new derivation method. Each approach has its own advantages and disadvantages, and many issues have to be addressed when setting up a water quality benchmark development program or when deriving a water quality benchmark. Each of these tasks requires a special expertise. They may seem simple, but are complex in their details. The intention of this paper was to provide some guidance for this process of water quality benchmark development on the program level, for the derivation methodology development, and in the actual benchmark derivation step, as well as to point out some issues (notably the inclusion of adapted populations and cryptic species and points to consider in the use of the species sensitivity distribution approach) and future opportunities (an international data repository and international collaboration in water quality benchmark development).
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Juillerat-Jeanneret L, Dusinska M, Fjellsbø LM, Collins AR, Handy RD, Riediker M. Biological impact assessment of nanomaterial used in nanomedicine. introduction to the NanoTEST project. Nanotoxicology 2013; 9 Suppl 1:5-12. [PMID: 23875681 DOI: 10.3109/17435390.2013.826743] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Therapeutic nanoparticles (NPs) are used in nanomedicine as drug carriers or imaging agents, providing increased selectivity/specificity for diseased tissues. The first NPs in nanomedicine were developed for increasing the efficacy of known drugs displaying dose-limiting toxicity and poor bioavailability and for enhancing disease detection. Nanotechnologies have gained much interest owing to their huge potential for applications in industry and medicine. It is necessary to ensure and control the biocompatibility of the components of therapeutic NPs to guarantee that intrinsic toxicity does not overtake the benefits. In addition to monitoring their toxicity in vitro, in vivo and in silico, it is also necessary to understand their distribution in the human body, their biodegradation and excretion routes and dispersion in the environment. Therefore, a deep understanding of their interactions with living tissues and of their possible effects in the human (and animal) body is required for the safe use of nanoparticulate formulations. Obtaining this information was the main aim of the NanoTEST project, and the goals of the reports collected together in this special issue are to summarise the observations and results obtained by the participating research teams and to provide methodological tools for evaluating the biological impact of NPs.
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Schilter B, Benigni R, Boobis A, Chiodini A, Cockburn A, Cronin MTD, Lo Piparo E, Modi S, Thiel A, Worth A. Establishing the level of safety concern for chemicals in food without the need for toxicity testing. Regul Toxicol Pharmacol 2013; 68:275-96. [PMID: 24012706 DOI: 10.1016/j.yrtph.2013.08.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Revised: 08/27/2013] [Accepted: 08/28/2013] [Indexed: 10/26/2022]
Abstract
There is demand for methodologies to establish levels of safety concern associated with dietary exposures to chemicals for which no toxicological data are available. In such situations, the application of in silico methods appears promising. To make safety statement requires quantitative predictions of toxicological reference points such as no observed adverse effect level and carcinogenic potency for DNA-reacting chemicals. A decision tree (DT) has been developed to aid integrating exposure information and predicted toxicological reference points obtained with quantitative structure activity relationship ((Q)SAR) software and read across techniques. The predicted toxicological values are compared with exposure to obtain margins of exposure (MoE). The size of the MoE defines the level of safety concern and should account for a number of uncertainties such as the classical interspecies and inter-individual variability as well as others determined on a case by case basis. An analysis of the uncertainties of in silico approaches together with results from case studies suggest that establishing safety concern based on application of the DT is unlikely to be significantly more uncertain than based on experimental data. The DT makes a full use of all data available, ensuring an adequate degree of conservatism. It can be used when fast decision making is required.
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Affiliation(s)
- Benoît Schilter
- Nestlé Research Centre, Vers-Chez-Les-Blanc, Lausanne, Switzerland
| | | | - Alan Boobis
- Imperial College London, London, United Kingdom
| | | | | | | | - Elena Lo Piparo
- Nestlé Research Centre, Vers-Chez-Les-Blanc, Lausanne, Switzerland
| | | | - Anette Thiel
- DSM Nutritional Products, Kaiseraugst, Switzerland
| | - Andrew Worth
- European Commission - Joint Research Centre, Institute for Health & Consumer Protection, Ispra, Italy
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Belkebir E, Rousselle C, Duboudin C, Bodin L, Bonvallot N. Haber's rule duration adjustments should not be used systematically for risk assessment in public health decision-making. Toxicol Lett 2011; 204:148-55. [DOI: 10.1016/j.toxlet.2011.04.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2010] [Revised: 04/21/2011] [Accepted: 04/23/2011] [Indexed: 10/18/2022]
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Schenk L, Johanson G. A Quantitative Comparison of the Safety Margins in the European Indicative Occupational Exposure Limits and the Derived No-Effect Levels for Workers under REACH. Toxicol Sci 2011; 121:408-16. [DOI: 10.1093/toxsci/kfr056] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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