1. Department of Endocrinology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
2. Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
3. Center for the Study of Aging and Human Development, Department of Medicine, Duke University, Durham, North Carolina
4. Epidemiology and Statistics, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Science, Chinese Academy of Medical Sciences, Beijing, China
5. Case Registry Office, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
6. Department of Obstetrics, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
7. Center of Laboratory, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
8. Department of Endocrinology and Diabetes, Aarhus University Hospital, Aarhus, Denmark
9. Center for the Study of Aging and Human Development, Department of Medicine, Duke University, Durham, North Carolina, and China Center for Economic Research of Peking University, Beijing, China