1. Department of Family and Community Medicine, University of California, San Francisco, CA, USA
2. Beijing Office for Cancer Prevention and Control, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Peking University Cancer Hospital & Institute, Beijing, China
3. Department of Cancer Epidemiology, National Cancer Center/National Clinical Research Center for Cancer/ Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
4. Department of Epidemiology, UNC Gillings School of Global Public Health, Chapel Hill, NC, USA
5. Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC, USA