1. National Research Institute for Family Planning, Beijing, China
2. Department of Epidemiology and Health Statistics, School of Public Health, Medical College of Soochow University, Suzhou, Jiangsu, China
3. National Human Genetic Resources Center, Beijing, China
4. Graduate School of Peking Union Medical College, Beijing, China
5. Institute of Epidemiology and Statistics, School of Public Health, Lanzhou University, Lanzhou, China
6. Department of Maternal and Child Health, National Health Commission of the People’s Republic of China, Beijing, China
7. Jiangsu Key Laboratory of Preventive and Translational Medicine for Major Chronic Non-communicable Diseases, Soochow University, Jiangsu, China
8. MOE Key Laboratory of Geriatric Diseases and Immunology, Suzhou Medical College of Soochow University, Suzhou, Jiangsu, China