[1] National Institutes of Health,Division of Cancer Control and Population Sciences, National Cancer Institute
[2] Georgetown University,Department of Oncology
[3] Departments of Medicine and Epidemiology and Biostatistics,Boston University Schools of Medicine and Public Health
[4] Washington Cancer Institute at Washington Hospital Center,Division of Epidemiology
[5] Columbia University School of Public Health,Institute for Health Care Research and Policy
[6] Georgetown University,undefined