1. Department of Dermatology, The University of California San Francisco, San Francisco, California;
2. Department of Dermatology, University of Texas MD Anderson Cancer Center, Houston, Texas;
3. Department of Dermatology, The University of Texas Health Science Center at Houston, McGovern Medical School, Houston, Texas;
4. Departments of Dermatology and Head and Neck Surgery, University of Texas MD Anderson Cancer Center, Houston, Texas