Department of Dermatology, Icahn School of Medicine at Mount Sinai, New York, New York. Electronic address: lebwohl@aol.com. Department of Dermatology, Icahn School of Medicine at Mount Sinai, New York, New York. Department of Dermatology, University Hospital of Nice, Nice, France. LEO Pharma Ballerup, Ballerup, Denmark. Lynde Dermatology, Probity Medical Research, Markham, Ontario, Canada; Department of Medicine, University of Toronto, Toronto, Ontario, Canada. K. Papp Clinical Research, Waterloo, Ontario, Canada. Department of Dermatology, University Hospital of St-Etienne, St-Etienne, France. Department of Dermatology, Henry Ford Hospital, Detroit, Michigan. Wansford and Kings Cliffe Practice, Wansford, Cambridgeshire, United Kingdom. Institute and Comprehensive Center for Inflammation Medicine, University of Lübeck, Lübeck, Germany. Dermatology Centre, Salford Royal National Health Service Foundation Trust, Manchester National Institute for Health Research Biomedical Research Centre, University of Manchester, Manchester, United Kingdom. Department of Dermatology and Allergology, Ludwig Maximilian University Munich, Munich, Germany.