1 School of Medicine, Eastern Virginia Medical School, Norfolk, Virginia.
2 Department of Dermatology, Henry Ford Health System, Detroit, Michigan.
3 Department of Dermatology, University of Colorado Anschutz Medical Campus, Aurora, Colorado; Department of Epidemiology, Colorado School of Public Health, University of Colorado Anschutz Medical Campus, Aurora, Colorado; Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, Colorado. Electronic address: robert.dellavalle@ucdenver.edu.