[1] Charite Univ Med Berlin, Berlin, Germany
[2] Humboldt Univ, Freie Univ Berlin, Dept Dermatol Venereol & Allergol, Berlin, Germany
[3] Berlin Inst Hlth, Berlin, Germany
[4] St Johns Inst Dermatol, London, England
[5] Acad Med Ctr Amsterdam, Amsterdam, Netherlands
[6] Univ Szeged, Szeged, Hungary
[7] Off Based Dermatol Practice, Geel, Belgium
[8] Radboud Univ Nijmegen Med Ctr, Nijmegen, Netherlands
[9] Fdn Piel Sana AEDV, Unidad Invest, Madrid, Spain
[10] Univ Verona, Verona, Italy
[11] Univ Hosp Copenhagen, Copenhagen, Denmark
[12] Guys & St Thomas NHS Fdn Trust, London, England
[13] Helsinki Univ Cent Hosp, Helsinki, Finland
[14] Univ Hosp Zurich, Dept Dermatol, Zurich, Switzerland
[15] Int Federat Psoriasis Assoc IFPA, Zurich, Switzerland
[16] Univ Klinikum Schleswig Holstein, Kiel, Germany
[17] Univ Med Ctr Hamburg Eppendorf, Inst Hlth Serv Res Dermatol & Nursing, Translat Res Inflammatory Skin Dis, Hamburg, Germany
[18] Univ Debrecen, Debrecen, Hungary
[19] Aarhus Univ Hosp, Aarhus, Denmark
[20] Municipal Hosp Hietzing, Vienna, Austria
[21] Umea Univ, Dermatol, Dept Publ Hlth & Clin Med, Umea, Sweden
[22] Med Univ Warsaw, Dept Dermatol, Warsaw, Poland
[23] Off Based Dermatol Practice, Monchengladbach, Germany
[24] Oslo Univ Hosp, Oslo, Norway
[25] Univ Bern, Univ Hosp Bern, Dept Dermatol, Inselspital, Bern, Switzerland