1. From the Divisions of Epidemiology and Hematology/Oncology, University of California, Irvine, College of Medicine, Irvine; Biostatistics Shared Resource, Chao Family Comprehensive Cancer Center, University of California, Irvine; Center for Sickle Cell Disease, Howard University, Washington, DC; Center for Health Policy Research and Education, Duke University, Durham, NC; and Veterans Affairs Long Beach Health Care System, Long Beach, CA.