[1] Rheumazentrum Ruhrgebiet, Herne, Germany
[2] Ruhr Univ Bochum, Bochum, Germany
[3] Natl & Kapodistrian Univ Athens, Joint Rheumatol Programme, Med Sch, Athens, Greece
[4] Norfolk & Norwich Univ Hosp NHS Fdn Trust, Norwich, Norfolk, England
[5] Municipal Hosp Hietzing, Dept Dermatol, Vienna, Austria
[6] Co Med Study & Serv Selters CMS3 GmbH, Selters, Germany
[7] Olymp Therapeutir, Patras, Greece
[8] Univ Hosp Coventry & Warwickshire NHS Trust, Coventry, W Midlands, England
[9] CHU Vaudois, Lausanne, Switzerland
[10] Natl & Kapodistrian Univ Athens, Med Sch, Dermatol & Venerol, Athens, Greece
[11] Reg Hosp, Orleans, France
[12] Univ Orleans, Orleans, France
[13] Univ Pisa, Dermatol Dept, Lungarno Antonio Pacinotti 43, Pisa 56126, PI, Italy
[14] Catholic Univ Louvain, Clin St Luc, Dermatol, Brussels, Belgium
[15] Rheumatol Schwerpunktpraxis, Berlin, Germany
[16] Med Univ, Dept Internal Med, Sofia, Bulgaria
[17] Novartis Pharma AG, Basel, Switzerland
[18] Novartis Farma SpA, Origgio, Italy
[19] Novartis Pharma GmbH, Nurnberg, Germany
[20] Univ Med Ctr Hamburg, Inst Hlth Serv Res Dermatol & Nursing, Hamburg, Germany