1. Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
2. Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland
3. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
4. Department of Oncology, Johns Hopkins School of Medicine, Baltimore, Maryland
5. Analysis Group, New York, New York
6. Department of Sociology, Johns Hopkins University, Baltimore, Maryland
7. Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, Maryland
8. Department of Health, Behavior, and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland