Affiliation: | 1. Dermatology Services, Veterans Affairs Medical Center, and Department of Dermatology, University of California, San Francisco, CA, USA;2. Department of Ornithology & Mammals, California Academy of Sciences, San Francisco, CA, USA;3. National Institutes of General Medical Sciences (retired), Bethesda, MD, USA;4. Department of Geography, University of Wisconsin, Madison, WI, USA |