1. From the *Department of Dermatology, University of California, San Francisco, San Francisco, California, USA.
2. †Department of Internal Medicine, Santa Clara Valley Medical Center, 751 S Bascom Ave, San Jose, California, USA.
3. ‡Department of Dermatology, Boston University School of Medicine, Boston, Massachusetts, USA.
4. §Department of Dermatology, Howard University, Washington, District of Columbia, USA.