1 Columbia University College of Physicians and Surgeons, New York, New York.
2 Department of Dermatology, University of Colorado Anschutz Medical Campus, Aurora.
3 Department of Dermatology, University of Colorado Anschutz Medical Campus, Aurora3Department of Epidemiology, Colorado School of Public Health, University of Colorado Anschutz Medical Campus, Aurora4Department of Dermatology, Denver Veterans Administratio.