[1] Royo Villanova Hosp, Aragon Hlth Sci Inst IACS, Dept Dermatol, Zaragoza, Spain
[2] Univ Zaragoza, Aragon Hlth Sci Inst IACS, Dept Psychol, Zaragoza, Spain
[3] Aragon Hlth Sci Inst IACS, Bioinformat Grp, Zaragoza, Spain
[4] Justus Liebig Univ, Dept Dermatol, Giessen, Germany
[5] Justus Liebig Univ, Inst Med Psychol, Giessen, Germany
[6] Innlandet Hosp Trust, Norwegian Natl Advisory Unit Concurrent Subst Abu, Brumunddal, Norway
[7] Cardiff Univ, Sch Med, Dept Dermatol & Wound Healing, Cardiff, S Glam, Wales
[8] ULB Hosp ERASME, Dept Dermatol, Brussels, Belgium
[9] Univ Oslo, Sect Biostat, Oslo, Norway
[10] Wroclaw Med Univ, Dept Dermatol, Wroclaw, Poland
[11] Univ Hosp Brest, Dept Dermatol, Brest, France
[12] Zealand Univ Hosp, Dept Dermatol, Roskilde, Denmark
[13] IM Sechenov First Moscow State Med Univ, Dept Psychiat & Psychosomat, Moscow, Russia
[14] Ist Dermopat Immacolata, Clin Epidemiol Unit, Rome, Italy
[15] Univ Szeged, Dept Dermatol & Allergol, Szeged, Hungary
[16] Sisli Etfal Teaching & Res Hosp, Dept Dermatol, Istanbul, Turkey
[17] Radboud Univ Nijmegen, Med Ctr, Dept Med Psychol, Nijmegen, Netherlands
[18] Stavanger Univ Hosp, Dept Dermatol, Stavanger, Norway
[19] Oslo Univ Hosp, Dept Dermatol, Oslo, Norway
[20] Univ Oslo, Inst Clin Med, Oslo, Norway