1. Department of Dermatology; Stavanger University Hospital; Stavanger Norway
2. Institute of Medical Psychology; Justus Liebig University; Giessen Germany
3. Innlandet Hospital Trust; Brumundal Norway
4. Hedmark University College; Elverum Norway
5. Department of Dermatology; Justus Liebig University; Giessen Germany
6. Department of Dermatology; Cardiff University School of Medicine; Cardiff U.K.
7. Department of Psychology; University of Zaragoza; Zaragoza Spain
8. Department of Dermatology; ULB; Hospital Erasme; Brussels Belgium
9. Department of Dermatology; University Hospital of Brest; Brest France
10. Laboratory of Neurosciences of Brest; University of Western Brittany; Brest France
11. Clinical Epidemiology Unit; Istituto Dermopatico dell'Immacolata; Rome Italy
12. Health, Medical and Neuropsychology Unit; Leiden University; Leiden The Netherlands
13. Department of Dermatology; Oslo University Hospital Rikshospitalet; University of Oslo; Oslo Norway
14. Department of Dermatology; Wroclaw Medical University; Wroclaw Poland
15. Moscow Scientific and Practical Center of Dermatovenereology and Cosmetology; Moscow Russia
16. Department of Dermatology; Alcaniz Hospital; Alcaniz Spain
17. Department of Pharmacy, Pharmacology and Postgraduate Medicine; School of Life and Medical Sciences; Hatfield U.K.
18. Department of Dermatology and Venereology; Skåne University Hospital; Lund University; S-20502 Malmö Sweden