1 School of Medicine, University of Colorado, Aurora, Colorado.
2 College of Osteopathic Medicine, Rocky Vista University, Parker, Colorado.
3 Department of Dermatology, University of Colorado Anschutz Medical Campus, Aurora, Colorado.
4 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.