1. Department of Dermatology; University of Illinois at Chicago College of Medicine; Chicago IL U.S.A.
2. Department of Dermatology; Colorado School of Public Health; University of Colorado Anschutz Medical Campus; Aurora CO U.S.A.
3. Michigan State University College of Human Medicine; Grand Rapids MI U.S.A.
4. Dermatology Service; U.S. Department of Veterans Affairs; Eastern Colorado Health Care System; Denver CO U.S.A.
5. Department of Epidemiology; Colorado School of Public Health; University of Colorado Anschutz Medical Campus; Aurora CO U.S.A.