1. Department of Dermatology, University of California, San Francisco2Stanford University School of Medicine, Stanford, California3Department of Public Health and Primary Care, University of Cambridge, Cambridge, England
2. Department of Dermatology, University of California, San Francisco4Department of Dermatology, San Francisco Veterans Affairs Medical Center, San Francisco, California
3. University of California, Berkeley
4. Department of Internal Medicine, John Muir Medical Center, Walnut Creek, California
5. Department of Public Health and Primary Care, University of Cambridge, Cambridge, England
6. Stanford University School of Medicine, Stanford, California
7. Department of Epidemiology and Biostatistics, University of California, San Francisco
8. Department of Dermatology, University of California, San Francisco