1. Department of Dermatology and Venereology; National Medical University; Kiev Ukraine
2. Oslo Centre for Biostatistics and Epidemiology; University of Oslo; Oslo Norway
3. Children's Hospital Zagreb; Medical School; University of Zagreb; Zagreb Croatia
4. Dermatology; Dali Medical; Bucharest Romania
5. Department of Dermatology, Venereology and Allergology; Wrocław Medical University; Wrocław Poland
6. Department of Psychology; University of Zaragoza; Zaragoza Spain
7. Department of Dermatology; Aragon Health Sciences Institute (IACS); Royo Villanova Hospital; Zaragoza Spain
8. Department of Dermatology; ULB-Erasme Hospital; Brussels Belgium
9. Institute for Health Services Research in Dermatology and Nursing (IVDP); University Medical Center Hamburg-Eppendorf; Hamburg Gemany
10. Whipps Cross University Hospital; London UK
11. The Royal London Hospital; London UK
12. Department of Medical Psychology; Academic Medical Center; Amsterdam The Netherlands
13. Dutch Skin Foundation; Nieuwegein The Netherlands
14. Department of Dermatology; Zealand University Hospital; Roskilde Denmark
15. Department of Pharmacy, Pharmacology and Postgraduate Medicine; School of Life & Medical Sciences; University of Hertfordshire; Hatfield UK
16. Clinical Epidemiology Unit; Istituto Dermopatico dell'Immacolata (IDI)-IRCCS FLMM; Rome Italy
17. Department of Dermatology and Venereology; Skane University Hospital; Malmö Sweden