1. 1Department of Endocrinology, NHC Key Laboratory of Endocrinology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
2. 2Department of Endocrinology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
3. 3Department of Epidemiology, School of Public Health and Tropical Medicine, Tulane University, New Orleans, Louisiana, USA
4. 6Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
5. 4Department of Endocrinology, The Children’s Hospital of Philadelphia, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
6. 5Department of Epidemiology, Capital Institute of Paediatrics, Beijing, China