1 Department of Dermatology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
2 National Psoriasis Foundation, Portland, Oregon, USA.
3 Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
4 Department of Dermatology and Cutaneous Surgery, University of South Florida, Tampa, Florida, USA.
5 Division of Dermatology, University of California, Los Angeles, Los Angeles, California, USA.
6 Women's College Research Institute, Women's College Hospital, University of Toronto, Toronto, Canada.
7 Swedish Medical Center, Providence St Joseph Health, University of Washington School of Medicine, Seattle, Washington, USA.
8 Division of Rheumatology, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA; Center for Clinical Epidemiology and Biostatistics (CCEB), Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
9 Division of Immunology and Rheumatology, Stanford University School of Medicine, Palo Alto, California, USA.
10 Department of Dermatology, Icahn School of Medicine at Mt Sinai, New York, New York, USA.
11 Division of Rheumatic Diseases, Department of Internal Medicine, UT Southwestern Medical Center, Dallas, Texas, USA; Department of Dermatology, UT Southwestern Medical Center, Dallas, Texas, USA; O'Donnell School of Public Health, UT Southwestern Medical Center, Dallas, Texas, USA. Electronic address: joseph.merola@utsouthwestern.edu.