Affiliation: | 1. Department of Dermatology, University of Minnesota, Minneapolis, Minnesota, USA;2. Division of Epidemiology and Community Health, School of Public, Health-University of Minnesota, Minneapolis, Minnesota, USA Masonic Cancer Center, University of Minnesota, Minneapolis, Minnesota, USA;3. Department of Medicine, Division of Dermatology, University of Chicago, Chicago, Illinois, USA;4. Masonic Cancer Center, University of Minnesota, Minneapolis, Minnesota, USA |