1. The Dermatology Centre, Manchester Academic Health Science Centre, Barnes Building, Salford Royal NHS Foundation Trust, Manchester, United Kingdom;
2. Department of Dermatology, Kaiser Permanente Los Angeles Medical Center, Los Angeles, CA, USA;
3. Radboud University Nijmegen Medical Centre, the Netherlands;
4. Memorial University of Newfoundland, St. Johns, NL, Canada;
5. International Psoriasis Council, St. Louis, MO, USA;
6. Dept. of Dermatology, Aarhus University Hospital, Aarhus C, DK, 8000, Denmark