From the Departments of Nutrition (C.A.A., F.B.H., W.C.W.), Epidemiology (F.B.H., D.S., W.C.W.), and Biostatistics (D.S.), Harvard School of Public Health, Boston, MA; Channing Laboratory, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (F.B.H., E.C., M.D.H., W.C.W.); and Division of Oncology, Department of Surgery, University of Ibadan, University College Hospital, Ibadan, Oyo State, Nigeria (C.A.A.)