1. Department of Dermatology Minneapolis VA Health Care System Minneapolis MN USA
2. Department of Dermatology University of Minnesota Minneapolis MN USA
3. Center for Chronic Disease Outcomes Research Minneapolis VA Health Care System Minneapolis MN USA
4. University of Minnesota Medical School Minneapolis MN USA
5. Division of Dermatology Loyola University Medical Center Maywood IL USA
6. Department of Dermatology Stanford University School of Medicine Stanford CA USA