1. Department of Dermatology University Hospital Brest France
2. Department of Dermatology Oslo University Hospital Oslo University Oslo Norway
3. Department of Dermatology and Venereology Skåne University Hospital Lund University Malmö Sweden
4. National Centre for Dual Diagnosis Innlandet Hospital Trust Brumunddal Norway
5. Department of Dermatology Stavanger University Hospital Stavanger Norway
6. Clinical Epidemiology Unit Istituto Dermopatico dell'Immacolata (IDI)‐ IRCCS FLMM Rome Italy
7. Section of Biostatistics University of Oslo Oslo Norway
8. Department of Health, Medicine and Neuropsychology Leiden University Leiden The Netherlands
9. Department of Dermatology Zealand University Hospital Faculty of Health Sciences University of Copenhagen Copenhagen Denmark
10. Department of Dermatology Justus Liebig University Giessen Germany
11. Department of Dermatology, Venereology and Allergology Wroclaw Medical University Wroclaw Poland
12. Department of Dermatology Universite Libre de Bruxelles Brussels Belgium
13. Dermatology and Veneteology Clinic Şişli Hamidiye Etfal Training and Research Center University of Health Science Istanbul Turkey
14. Department of Dermatology Cardiff University School of Medicine Cardiff UK
15. School of Life and Medical Sciences University of Hertfordshire Hatfield UK
16. Department of Dermatology and Allergology University of Szeged Szeged Hungary
17. Moscow Scientific and Practical Centre of Dermatovenereology and Cosmetology Moscow Russia
18. Department of Dermatology Royo Villanova Hospital Zaragoza Spain
19. Department of Psychology University of Zaragoza Zaragoza Spain
20. Institute of Medical Psychology Justus Liebig University Giessen Germany