1. Mount Zion Cancer Research Center, Department of Dermatology, University of California, San Francisco2Section of Dermatology, Department of Medical Sciences, University of Turin, Turin, Italy
2. Mount Zion Cancer Research Center, Department of Dermatology, University of California, San Francisco3School of Medicine, Stanford University, Stanford, California
3. Mount Zion Cancer Research Center, Department of Dermatology, University of California, San Francisco
4. Department of Epidemiology and Biostatistics, University of California, San Francisco
5. Center for Devices and Radiological Health, Division of Physics, US Food and Drug Administration, Silver Spring, Maryland
6. Mount Zion Cancer Research Center, Department of Dermatology, University of California, San Francisco6Department of Dermatology,The Rudolfstiftung Hospital, Vienna, Austria
7. Section of Dermatology, Department of Medical Sciences, University of Turin, Turin, Italy