1. Department of Health Services Research, The University of Texas MD Anderson Cancer Center, Houston
2. McGovern Medical School, The University of Texas Health Science Center at Houston, Houston
3. Department of Dermatology, University of Pennsylvania Perelman School of Medicine, Philadelphia
4. Department of Biostatistics, Epidemiology, and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia
5. Department of Dermatology, The University of Texas MD Anderson Cancer Center, Houston