1. From the Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.
2. Alix School of Medicine, Mayo Clinic, Rochester, Minnesota, USA.
3. Departments of Internal Medicine and Dermatology, University of Minnesota, Minneapolis, Minnesota, USA.
4. Department of Dermatology, Mayo Clinic, Jacksonville, Florida, USA.
5. Department of Dermatology, Mayo Clinic, Scottsdale, Arizona, USA.
6. Department of Quantitative Health Sciences, Mayo Clinic, Rochester, Minnesota, USA.