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Lawlor C, Vitoratou S, Duffy J, Cooper B, De Souza T, Le Boutillier C, Carter B, Hepworth C, Jolley S. Managing emotions in psychosis: Evaluation of a brief DBT-informed skill group for individuals with psychosis in routine community services. BRITISH JOURNAL OF CLINICAL PSYCHOLOGY 2022; 61:735-756. [PMID: 35130354 PMCID: PMC9543194 DOI: 10.1111/bjc.12359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 01/19/2022] [Indexed: 12/02/2022]
Abstract
Objectives Individuals with psychosis report that emotion regulation (ER) difficulties are treatment priorities, yet little is known about how targeted ER interventions may help. We evaluated a new eight‐session Dialectical Behavioural Therapy (DBT)–informed skills group specifically adapted for individuals with psychosis: the Managing Emotions Group (MEG) in diverse, inner‐city community services. Method A mixed‐method design was utilised to assess the feasibility (acceptability and potential clinical impact) of local delivery of MEG. Uptake, completion (≥50% of sessions), post‐session satisfaction ratings, and thematic analysis of qualitative feedback from 12 completers assessed acceptability. Pre–post‐intervention changes in psychological distress, self‐reported ER difficulties, and adaptive ER skill use assessed potential clinical impact. Results Forty‐eight individuals (81% of attenders) completed the intervention (Mage = 43, 54% female) of whom 39 completed pre‐ and post‐group measures. Participants reported high satisfaction and meaningful improvements in understanding and managing emotions, with positive impact on daily life. Self‐reported psychological distress, ER difficulties, and adaptive ER skill use significantly improved, with medium‐to‐large pre‐post effects (d = 0.5–0.7) except lack of emotional clarity (d = 0.3). Conclusions MEG was feasible and acceptable, and a future feasibility randomised controlled trial is warranted. Practitioner points Individuals with psychosis report that support with their emotions is a priority. Brief interventions for emotion regulation difficulties are acceptable to individuals with psychosis and can be feasibly delivered in a local outpatient service. Distress and emotion regulation difficulties and skills improved significantly from pre–post treatment for clients completing the managing emotions group. Further implementation and evaluation are needed to support continued refinement to meet the needs and priorities of individuals with psychosis.
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Affiliation(s)
- Caroline Lawlor
- Department of Psychology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK.,South London and Maudsley NHS Foundation Trust, London, UK
| | - Silia Vitoratou
- Psychometrics and Measurement Lab, Department of Biostatistics and Health Informatics, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - James Duffy
- South London and Maudsley NHS Foundation Trust, London, UK
| | - Ben Cooper
- South London and Maudsley NHS Foundation Trust, London, UK
| | | | - Clair Le Boutillier
- Department of Health Service & Population Research, Institute of Psychiatry, Psychology & Neuroscience, London, UK
| | - Ben Carter
- Psychometrics and Measurement Lab, Department of Biostatistics and Health Informatics, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | | | - Suzanne Jolley
- Department of Psychology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK.,South London and Maudsley NHS Foundation Trust, London, UK
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2
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Lawlor C, Vitoratou S, Hepworth C, Jolley S. Self-reported emotion regulation difficulties in psychosis: Psychometric properties of the Difficulties in Emotion Regulation Scale (DERS-16). J Clin Psychol 2021; 77:2323-2340. [PMID: 33971018 DOI: 10.1002/jclp.23164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 01/25/2021] [Accepted: 04/12/2021] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Individuals with psychosis self-report difficulties in understanding, relating, and responding to emotions as treatment priorities, yet we lack comprehensive, reliable, and valid assessments for routine clinical use. METHODS The psychometric properties of a brief version of the Difficulties in Emotion Regulation Scale-16 (DERS-16) were examined using anonymized data from a sample of 150 outpatients with psychosis. RESULTS Confirmatory factor analysis supported the five-factor structure of the DERS-16. The model fit was further improved by omitting two items. Measurement invariance was shown with respect to age and gender. The DERS-16 demonstrated good internal consistency, well comparable to the original DERS. Evidence toward convergent validity is also presented. CONCLUSION Findings suggest that the DERS-16 is a reliable and valid measure of self-reported emotion regulation difficulties in individuals with psychosis. Further research on the clinical utility of the DERS-16 is needed, including examination of its test-retest reliability and predictive validity in response to targeted interventions.
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Affiliation(s)
- Caroline Lawlor
- Department of Psychology, King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK.,North Lambeth Promoting Recovery Team, South London and Maudsley NHS Foundation Trust, London, UK
| | - Silia Vitoratou
- Psychometrics and Measurement Lab, Biostatistics and Health Informatics, King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - Claire Hepworth
- Department of Psychology, King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - Suzanne Jolley
- Department of Psychology, King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK.,North Lambeth Promoting Recovery Team, South London and Maudsley NHS Foundation Trust, London, UK
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Lemonde AC, Joober R, Malla A, Iyer SN, Lepage M, Boksa P, Shah JL. Delusional content at initial presentation to a catchment-based early intervention service for psychosis. Br J Psychiatry 2021; 218:217-223. [PMID: 32900414 DOI: 10.1192/bjp.2020.157] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
BACKGROUND During a psychotic episode, patients frequently suffer from severe maladaptive beliefs known as delusions. Despite the abundant literature investigating the simple presence or absence of these beliefs, there exists little detailed knowledge regarding their actual content and severity at the onset of illness. AIMS This study reports on delusions during the initiation of indicated treatment for first-episode psychosis (FEP). METHOD Data were systematically collected from a sample of 636 patients entering a catchment-based early intervention service for FEP. The average severity and frequency of each delusional theme at baseline was reported with the Scale for the Assessment of Positive Symptoms. Delusional severity (globally and per theme) was examined across a number of sociodemographic and clinical variables. RESULTS Delusions were present in the vast majority of individuals experiencing onset of FEP (94%), with persecutory (77.7%) being the most common theme. Persecutory delusions remained consistent in severity across diagnoses, but were more severe with older age at onset of FEP. No meaningful differences in delusional severity were observed across gender, affective versus non-affective psychosis, or presence/absence of substance use disorder. Globally, delusion severity was associated with anxiety, but not depression. Delusions commonly referred to as passivity experiences were related to hallucinatory experiences. CONCLUSIONS This community sample offers a rare clinical lens into the severity and content of delusions in FEP. Although delusional severity was consistent across certain sociodemographic and clinical variables, this was not always the case. Future research should now consider the course of delusion themes over time.
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Affiliation(s)
| | - Ridha Joober
- Department of Psychiatry, McGill University; and Program for Early Intervention and Prevention of Psychoses (PEPP-Montreal), Douglas Mental Health University Institute, Quebec, Canada
| | - Ashok Malla
- Department of Psychiatry and Department of Epidemiology and Biostatistics, McGill University; and Program for Early Intervention and Prevention of Psychoses (PEPP-Montreal), Douglas Mental Health University Institute, Quebec, Canada
| | - Srividya N Iyer
- Department of Psychiatry, McGill University; and Program for Early Intervention and Prevention of Psychoses (PEPP-Montreal), Douglas Mental Health University Institute, Quebec, Canada
| | - Martin Lepage
- Department of Psychiatry, McGill University; and Douglas Mental Health University Institute, Quebec, Canada
| | - Patricia Boksa
- Department of Psychiatry, McGill University; and Douglas Mental Health University Institute, Quebec, Canada
| | - Jai L Shah
- Department of Psychiatry, McGill University; and Program for Early Intervention and Prevention of Psychoses (PEPP-Montreal), Douglas Mental Health University Institute, Quebec, Canada
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Fordham B, Sugavanam T, Edwards K, Hemming K, Howick J, Copsey B, Lee H, Kaidesoja M, Kirtley S, Hopewell S, das Nair R, Howard R, Stallard P, Hamer-Hunt J, Cooper Z, Lamb SE. Cognitive-behavioural therapy for a variety of conditions: an overview of systematic reviews and panoramic meta-analysis. Health Technol Assess 2021; 25:1-378. [PMID: 33629950 PMCID: PMC7957459 DOI: 10.3310/hta25090] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Cognitive-behavioural therapy aims to increase quality of life by changing cognitive and behavioural factors that maintain problematic symptoms. A previous overview of cognitive-behavioural therapy systematic reviews suggested that cognitive-behavioural therapy was effective for many conditions. However, few of the included reviews synthesised randomised controlled trials. OBJECTIVES This project was undertaken to map the quality and gaps in the cognitive-behavioural therapy systematic review of randomised controlled trial evidence base. Panoramic meta-analyses were also conducted to identify any across-condition general effects of cognitive-behavioural therapy. DATA SOURCES The overview was designed with cognitive-behavioural therapy patients, clinicians and researchers. The Cochrane Library, MEDLINE, EMBASE, PsycINFO, Cumulative Index to Nursing and Allied Health Literature, Child Development & Adolescent Studies, Database of Abstracts of Reviews of Effects and OpenGrey databases were searched from 1992 to January 2019. REVIEW METHODS Study inclusion criteria were as follows: (1) fulfil the Centre for Reviews and Dissemination criteria; (2) intervention reported as cognitive-behavioural therapy or including one cognitive and one behavioural element; (3) include a synthesis of cognitive-behavioural therapy trials; (4) include either health-related quality of life, depression, anxiety or pain outcome; and (5) available in English. Review quality was assessed with A MeaSurement Tool to Assess systematic Reviews (AMSTAR)-2. Reviews were quality assessed and data were extracted in duplicate by two independent researchers, and then mapped according to condition, population, context and quality. The effects from high-quality reviews were pooled within condition groups, using a random-effect panoramic meta-analysis. If the across-condition heterogeneity was I2 < 75%, we pooled across conditions. Subgroup analyses were conducted for age, delivery format, comparator type and length of follow-up, and a sensitivity analysis was performed for quality. RESULTS A total of 494 reviews were mapped, representing 68% (27/40) of the categories of the International Classification of Diseases, Eleventh Revision, Mortality and Morbidity Statistics. Most reviews (71%, 351/494) were of lower quality. Research on older adults, using cognitive-behavioural therapy preventatively, ethnic minorities and people living outside Europe, North America or Australasia was limited. Out of 494 reviews, 71 were included in the primary panoramic meta-analyses. A modest effect was found in favour of cognitive-behavioural therapy for health-related quality of life (standardised mean difference 0.23, 95% confidence interval 0.05 to 0.41, prediction interval -0.05 to 0.50, I2 = 32%), anxiety (standardised mean difference 0.30, 95% confidence interval 0.18 to 0.43, prediction interval -0.28 to 0.88, I2 = 62%) and pain (standardised mean difference 0.23, 95% confidence interval 0.05 to 0.41, prediction interval -0.28 to 0.74, I2 = 64%) outcomes. All condition, subgroup and sensitivity effect estimates remained consistent with the general effect. A statistically significant interaction effect was evident between the active and non-active comparator groups for the health-related quality-of-life outcome. A general effect for depression outcomes was not produced as a result of considerable heterogeneity across reviews and conditions. LIMITATIONS Data extraction and analysis were conducted at the review level, rather than returning to the individual trial data. This meant that the risk of bias of the individual trials could not be accounted for, but only the quality of the systematic reviews that synthesised them. CONCLUSION Owing to the consistency and homogeneity of the highest-quality evidence, it is proposed that cognitive-behavioural therapy can produce a modest general, across-condition benefit in health-related quality-of-life, anxiety and pain outcomes. FUTURE WORK Future research should focus on how the modest effect sizes seen with cognitive-behavioural therapy can be increased, for example identifying alternative delivery formats to increase adherence and reduce dropout, and pursuing novel methods to assess intervention fidelity and quality. STUDY REGISTRATION This study is registered as PROSPERO CRD42017078690. FUNDING This project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 25, No. 9. See the NIHR Journals Library website for further project information.
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Affiliation(s)
- Beth Fordham
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Thavapriya Sugavanam
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Katherine Edwards
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Karla Hemming
- Institute of Applied Health Research, University of Birmingham, Birmingham, UK
| | - Jeremy Howick
- Faculty of Philosophy, University of Oxford, Oxford, UK
| | - Bethan Copsey
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Hopin Lee
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Milla Kaidesoja
- Department of Psychology and Logopedics, University of Helsinki, Helsinki, Finland
| | - Shona Kirtley
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Sally Hopewell
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Roshan das Nair
- Department of Psychiatry and Applied Psychology, University of Nottingham, Nottingham, UK
- Institute of Mental Health, Nottinghamshire Healthcare NHS Foundation Trust, Nottingham, UK
| | - Robert Howard
- Division of Psychiatry, University College London, London, UK
| | | | | | - Zafra Cooper
- Department of Psychiatry, Yale School of Medicine, New Haven, CT, USA
| | - Sarah E Lamb
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
- College of Medicine and Health, University of Exeter, Exeter, UK
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Steel C, Korrelboom K, Fazil Baksh M, Kingdon D, Simon J, Wykes T, Phiri P, van der Gaag M. Positive memory training for the treatment of depression in schizophrenia: A randomised controlled trial. Behav Res Ther 2020; 135:103734. [PMID: 33002684 DOI: 10.1016/j.brat.2020.103734] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 09/07/2020] [Accepted: 09/21/2020] [Indexed: 02/05/2023]
Affiliation(s)
- Craig Steel
- Oxford Health NHS Foundation Trust, Oxford, UK; School of Psychology, University of Reading, UK.
| | - Kees Korrelboom
- Department of Anxiety Disorders, PsyQ Parnassia Group, Psychiatric Center, The Hague, the Netherlands; Department of Medical and Clinical Psychiatry, Tilburg University, Tilburg, the Netherlands
| | - M Fazil Baksh
- Department of Mathematics and Statistics, University of Reading, Whiteknights, Reading, RG6 6AL, UK
| | - David Kingdon
- University of Southampton, Highfield, Southampton, SO17 1BJ, UK
| | - Judit Simon
- Department of Health Economics, Center for Public Health, Medical University of Vienna, 1090, Wien, Kinderspitalgasse 15, Austria; Department of Psychiatry, University of Oxford and Oxford Health NHS Trust, Warneford Hospital, Oxford OX3 7JX, UK
| | - Til Wykes
- Department of Psychology, Institute of Psychiatry, Psychology & Neuroscience, London, UK
| | - Peter Phiri
- Southern Health NHS Foundation Trust, Research & Development Department, Tom Rudd Unit, Moorgreen Hospital, Botley Rd, West End Southampton, SO30 3JB, UK
| | - Mark van der Gaag
- VU University and Amsterdam Public Mental Health Research Institute, Department of Clinical Psychology Van der Boechorststraat 1, 1081, BT, Amsterdam, the Netherlands; Parnassia Psychiatric Institute, Zoutkeetsingel 40, 2512, HN, The Hague, the Netherlands
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An Analysis of the Pattern of Adaptive Emotion Regulation Associated with Low Paranoid Ideation in Healthy and Clinical Samples. COGNITIVE THERAPY AND RESEARCH 2020. [DOI: 10.1007/s10608-020-10173-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Abstract
Background
Research on emotion regulation and paranoid ideation has mostly focused on isolated regulation strategies and has remained largely inconclusive. According to the emotion regulation model by Berking and Whitley (in: Affect Regulation Training, Springer, New York 2014) successful modification or acceptance/tolerance of emotions requires an adequate comprehension (awareness, clarity, understanding) of emotions and adequate self-support.
Method
Building on this model, we investigated whether comprehension and self-support strengthen the negative association between modification and acceptance/tolerance and paranoid ideation. In study 1, we examined the hypotheses cross-sectionally based on questionnaire data from a combined sample (N = 125) consisting of people with a psychotic disorder, people at risk of developing psychosis, and healthy controls. In study 2, we examined the same hypotheses longitudinally by employing the experience sampling method in people with clinically relevant psychopathology below diagnostic threshold (N = 138).
Results
In study 1, the association between modification and paranoid ideation was not moderated by comprehension or self-support. However, comprehension and self-support moderated the association between acceptance/tolerance and paranoid ideation. In study 2, the interaction effect between comprehension and acceptance/tolerance on paranoid ideation was confirmed.
Conclusion
The results indicate that comprehending and accepting/tolerating emotions could be protective against paranoid ideation.
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Lawlor C, Hepworth C, Smallwood J, Carter B, Jolley S. Self-reported emotion regulation difficulties in people with psychosis compared with non-clinical controls: A systematic literature review. Clin Psychol Psychother 2020; 27:107-135. [PMID: 31661593 DOI: 10.1002/cpp.2408] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 10/15/2019] [Accepted: 10/16/2019] [Indexed: 01/10/2023]
Abstract
Emotions play a key role in the development and experience of psychosis, yet there are important gaps in our understanding of how individuals with psychosis understand and respond to their emotions. This systematic review investigated self-reported emotion regulation difficulties in individuals with psychosis compared with non-clinical controls. An electronic database search was conducted in Medline, PsychINFO, and Embase and supplemented by searches of reference lists and citations. Seventeen studies were included. A narrative synthesis was conducted because contextual diversity was present across the studies and outcomes. Individuals with psychosis reported greater difficulties in (i) emotional clarity (specifically with identifying, describing, and understanding their emotions), (ii) emotional acceptance, (iii) engaging in goal-directed behaviours when experiencing negative emotions, and (iv) willingness to experience emotional distress in the pursuit of meaningful activities in life. Evidence pertaining to other self-reported emotion regulation difficulties was less clear. Effect sizes were generally large in magnitude but there were few studies on some self-reported emotion regulation difficulties, and all studies were at moderate to high risk of bias. Further research is needed to clarify the nature of emotion regulation difficulties in individuals with psychosis to inform the provision of targeted clinical interventions.
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Affiliation(s)
- Caroline Lawlor
- North Lambeth Focused Support Team, South London and Maudsley NHS Foundation Trust, London, UK.,Department of Psychology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Claire Hepworth
- North Lambeth Focused Support Team, South London and Maudsley NHS Foundation Trust, London, UK
| | - Jane Smallwood
- North Lambeth Focused Support Team, South London and Maudsley NHS Foundation Trust, London, UK
| | - Ben Carter
- Department of Biostatistics and Health Informatics, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Suzanne Jolley
- North Lambeth Focused Support Team, South London and Maudsley NHS Foundation Trust, London, UK.,Department of Psychology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
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Ludwig L, Werner D, Lincoln TM. The relevance of cognitive emotion regulation to psychotic symptoms – A systematic review and meta-analysis. Clin Psychol Rev 2019; 72:101746. [DOI: 10.1016/j.cpr.2019.101746] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 04/26/2019] [Accepted: 06/11/2019] [Indexed: 12/24/2022]
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Mehl S, Schlier B, Lincoln TM. Does CBT for Psychosis Have an Impact on Delusions by Improving Reasoning Biases and Negative Self-Schemas? ZEITSCHRIFT FUR PSYCHOLOGIE-JOURNAL OF PSYCHOLOGY 2018. [DOI: 10.1027/2151-2604/a000335] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Abstract. Cognitive-behavioral therapy for psychosis (CBTp) builds on theoretical models that postulate reasoning biases and negative self-schemas to be involved in the formation and maintenance of delusions. However, it is unclear whether CBTp induces change in delusions by improving these proposed causal mechanisms. This study reports on a mediation analysis of a CBTp effectiveness trial in which delusions were a secondary outcome. Patients with psychosis were randomized to individualized CBTp (n = 36) or a waiting list condition (WL; n = 34). Reasoning biases (jumping to conclusions, theory of mind, attribution biases) and self-schemas (implicit and explicit self-esteem; self-schemas related to different domains) were assessed pre- and post-therapy/WL. The results reveal an intervention effect on two of four measures of delusions and on implicit self-esteem. Nevertheless, the intervention effect on delusions was not mediated by implicit self-esteem. Changes in explicit self-schemas and reasoning biases did also not mediate the intervention effects on delusions. More focused interventions may be required to produce change in reasoning and self-schemas that have the potential to carry over to delusions.
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Affiliation(s)
- Stephanie Mehl
- Department of Social Work and Health, University of Applied Sciences Frankfurt am Main, Germany
- Department of Psychiatry and Psychotherapy & Marburg Center for Mind, Brain and Behavior (MCMBB), Philipps-Universität Marburg, Germany
| | - Björn Schlier
- Clinical Psychology and Psychotherapy, Institute of Psychology, Faculty of Psychology and Movement Sciences, Universität Hamburg, Germany
| | - Tania M. Lincoln
- Clinical Psychology and Psychotherapy, Institute of Psychology, Faculty of Psychology and Movement Sciences, Universität Hamburg, Germany
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Affiliation(s)
- Tania M. Lincoln
- Clinical Psychology and Psychotherapy, Faculty of Psychology and Movement Sciences, Universität Hamburg, Germany
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