1. Department of Maternal, Child & Adolescent Health, School of Public Health, Key Laboratory of Population Health Across Life Cycle, Anhui Medical University (AHMU), Ministry of Education of the People's Republic of China, NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract, Anhui Provincial Key Laboratory of Population Health and Aristogenics, Hefei, China.
2. Ma'anshan Maternal and Child Health Center (MCHC), Ma'anshan, China.
3. Scientific Research Center in Preventive Medicine, School of Public Health, Anhui Medical University (AHMU), Hefei, China.