[1] Lund Univ, Skane Univ Hosp, Dept Dermatol & Venereol, Malmo, Sweden
[2] Justus Liebig Univ, Dept Dermatol, Giessen, Germany
[3] Justus Liebig Univ, Inst Med Psychol, Giessen, Germany
[4] Univ Zaragoza, Dept Psychol, Zaragoza, Spain
[5] Innlandet Hosp Trust, Natl Ctr Dual Diag, Brumunddal, Norway
[6] Univ Libre Bruxelles, Dept Dermatol, Brussels, Belgium
[7] Univ Copenhagen, Dept Clin Med, Copenhagen, Denmark
[8] Univ Hosp Brest, Dept Dermatol, Brest, France
[9] Univ Szeged, Dept Dermatol & Allergol, Szeged, Hungary
[10] Univ Oslo, Sect Biostat, Oslo, Norway
[11] Univ Oslo, Dept Dermatol, Oslo, Norway
[12] Ist Dermopat Immacolata, Clin Epidemiol Unit, Rome, Italy
[13] Fac Social & Behav Sci, Dept Hlth Med & Neuropsychol, Utrecht, Netherlands
[14] Stavanger Univ Hosp, Dept Dermatol, Stavanger, Norway
[15] Wroclaw Med Univ, Dept Dermatol, Wroclaw, Poland
[16] Moscow Sci & Pract Ctr Dermatovenereol & Cosmetol, Moscow, Russia
[17] Royo Villanova Hosp, Dept Dermatol, Zaragoza, Spain
[18] Univ Hlth Sci, Istanbul Sisli Hamidiye Efdal Hlth Training & Res, Istanbul, Turkey
[19] Cardiff Univ, Dept Dermatol, Sch Med, Cardiff, S Glam, Wales
[20] Univ Herdfordshire, Sch Life & Med Sci, Hatfield, Herts, England