1. Masonic Cancer Center, University of Minnesota, Minneapolis2Division of Epidemiology and Community Health, University of Minnesota, Minneapolis
2. Masonic Cancer Center, University of Minnesota, Minneapolis
3. Center for Dermatoepidemiology, VA Medical Center, Providence, Rhode Island4Department of Dermatology, Rhode Island Hospital, Providence5Department of Dermatology and Epidemiology, Brown University, Providence, Rhode Island
4. Masonic Cancer Center, University of Minnesota, Minneapolis6Department of Dermatology, University of Minnesota, Minneapolis
5. Department of Internal Medicine, University of New Mexico Cancer Center, Albuquerque8Division of Epidemiology and Biostatistics, University of New Mexico, Albuquerque