1. National Research Institute for Family Planning, Haidian District, Beijing, China
2. National Human Genetic Resource Center, Haidian District, Beijing, China
3. Graduate School of Peking Union Medical College, Dongdan Santiao, Dongcheng District, Beijing, China
4. School of Public Health, Hebei Medical University, Changan District, Shijiazhuang, China
5. Department of Endocrinology and Metabolism, The First Hospital of China Medical University, Shenyang, China
6. Department of Endocrinology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
7. Department of Maternal and Child Health, National Health Commission of the People’s Republic of China, Xicheng District, Beijing, China