1 Department of Dermatology, University of California at San Francisco School of Medicine, 1701 Divisadero Street, 3rd Floor, San Francisco, CA 94115. Electronic address: Liaowi@derm.ucsf.edu.
2 Department of Dermatology, University of California at San Francisco School of Medicine, 1701 Divisadero Street, 3rd Floor, San Francisco, CA 94115.