[1] Dermatologikum Hamburg, Dept Dermatol, DE-20354 Hamburg, Germany
[2] Univ Clin Schleswig Holstein, Dept Dermatol, Psoriasis Ctr, Kiel, Germany
[3] Univ Klinikums Erlangen, Hautklin, Erlangen, Germany
[4] Univ Manchester, Hope Hosp, Dermatol Ctr, Manchester, Lancs, England
[5] St Thomas Hosp, St Johns Inst Dermatol, London, England
[6] Univ Roma Tor Vergata, Dept Dermatol, Rome, Italy
[7] Univ Modena, Dermatol Clin, I-41100 Modena, Italy
[8] Hosp Univ Princesa, Dept Dermatol, Madrid, Spain
[9] Bispebjerg Hosp, Copenhagen, Denmark
[10] Univ Athens, Dermatol Clin, Athens, Greece
[11] GB Dalhousie Univ, Halifax, NS, Canada
[12] Hop Archet 2, Dept Dermatol, Nice, France
[13] Med Univ Innsbruck, Dept Dermatol, Innsbruck, Austria
[14] Univ Geneva, Dept Dermatol, Geneva, Switzerland