1. Department of Epidemiology and Health Statistics, School of Public Health, Anhui Medical University, Hefei 230032, China
2. Department of Maternal, Child & Adolescent Health, School of Public Health, Anhui Medical University, Hefei 230032, China
3. Key Laboratory of Population Health Across Life Cycle, Anhui Medical University, Ministry of Education of the People’s Republic of China, Hefei 230032, China
4. NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract, Hefei 230032, China
5. Anhui Provincial Key Laboratory of Population Health and Aristogenics/Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, Anhui Medical University, Hefei 230032, China
6. Anhui Provincial Center for Women and Child Health, Hefei 230001, China