1. Department of Dermatology, University of California, San Francisco, 513 Parnassus Avenue, San Francisco, CA 94143, USA.
2. Medical Scientist Training Program, University of California, San Francisco, 513 Parnassus Avenue, San Francisco, CA 94143, USA.
3. Department of Pathology, University of California, San Francisco, 513 Parnassus Avenue, San Francisco, CA 94143, USA.