1. Division of Dermatology, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
2. Department of Medicine, Harbor-UCLA Medical Center, Graduate Medical Education, Torrance, CA, USA
3. Division of Dermatology, Department of Medicine, University of Arizona, Tucson, AZ, USA
4. Department of Medicine Statistics Core, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
5. Department of Dermatology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA