1. Probity Medical Research, Waterloo, Ontario, Canada
2. K Papp Clinical Research, Waterloo, Ontario, Canada
3. LEO Pharma, Ballerup, Denmark
4. Center for Inflammatory Skin Diseases, Dept. of Dermatology, Venereology and Allergology, University Medical Center Schleswig-Holstein, Kiel, Germany
5. Section of Dermatology, Dept. of Clinical Medicine and Surgery, University of Naples Federico II, Naples, Italy
6. Dermatology Dept, Hospital de la Santa Creu i Sant Pau, Universitat Autònoma de Barcelona, Bellaterra, Barcelona
7. Dermatology Dept, Centro Médico Teknon, Quirónsalud, Barcelona