1. Department of Dermatology and Venereology; Skåne University Hospital; Lund University; Malmö Sweden
2. Department of Dermatology; Justus Liebig University; Giessen Germany
3. Department of Psychology; University of Zaragoza; Spain
4. National Centre for Dual Diagnosis; Innlandet Hospital Trust; Brumunddal Norway
5. Department of Dermatology; Universite libre de Bruxelles; Brussels Belgium
6. Department of Clinical Medicine; University of Copenhagen; Copenhagen Denmark
7. Department of Dermatology; University Hospital of Brest; Brest France
8. Department of Dermatology and Allergology; University of Szeged; Szeged Hungary
9. Section of Biostatistics; University of Oslo; Oslo Norway
10. Clinical Epidemiology Unit; Istituto Dermopatico dell'Immacolata; Rome Italy
11. Department of Health, Medical and Neuropsychology; Faculty of Social and Behavioral Science; the Netherlands
12. Department of Dermatology; University of Oslo; Oslo Norway
13. Department of Dermatology; Stavanger University Hospital; Stavanger Norway
14. Department of Dermatology; Wroclav Medical University; Wroclav Poland
15. Moscow Scientific and Practical Centre of Dermatovenereology and Cosmetology; Moscow Russia
16. Department of Dermatology; Royo Villanova Hospital; Zaragoza Spain
17. University of Health Science; Istanbul Sisli Hamidiye Efdal Health Training and Research Centre; Istanbul Turkey
18. Department of Dermatology; Cardiff University School of Medicine; Cardiff U.K..
19. School of Life and Medical Sciences; University of Herdfordshire; Hatfield U.K
20. Institute of Medical Psychology; Justus Liebig University; Giessen Germany