1. Department of Health Services Research, University of Texas MD Anderson Cancer Center, Houston
2. McGovern Medical School, The University of Texas Health Science Center at 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, University of Texas MD Anderson Cancer Center, Houston