1. Department of Cancer Epidemiology; National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College; Beijing People's Republic of China
2. UJMT Fogarty Consortium; NIH Fogarty International Center; Bethesda MD
3. Department of Family Medicine; University of Illinois at Chicago College of Medicine; Chicago IL
4. Department of Epidemiology; University of North Carolina; Chapel Hill NC