1. Department of Epidemiology & Biostatistics, School of Public Health, Peking University , Beijing , China
2. Department of Biostatistics, School of Public Health, Peking University , Beijing , China
3. Department of Biostatistics, Columbia University , New York, New York , USA
4. Department of Epidemiology, School of Public Health and Tropical Medicine, Tulane University , New Orleans, Louisiana , USA
5. Department of Nutrition, Harvard T.H. Chan School of Public Health , Boston, Massachusetts , USA
6. Key Laboratory of Epidemiology of Major Diseases (Peking University), Ministry of Education , Beijing , China