1. Center for Clinical Cancer Genetics & Global Health, Department of Medicine; University of Chicago; Chicago IL
2. Department of Public Health Sciences; University of Chicago; Chicago IL
3. Department of Medicine; University of Chicago; Chicago Illinois
4. Department of Surgery, College of Medicine; University of Ibadan; Ibadan Nigeria
5. Center for Population and Reproductive Health, College of Medicine, University of Ibadan; Ibadan Nigeria
6. Division of Epidemiology, Department of Medicine; Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University; Nashville TN
7. Department of Medicine; University of Pennsylvania; Philadelphia PA
8. Department of Preventive Medicine; State University of New York at Stony Brook; Stony Brook NY
9. Laboratory of Human Carcinogenesis; National Cancer Institute; Bethesda MD