Tianjin Women and Children's Health Centre, Tianjin, China. Department of Epidemiology, Capital Institute of Pediatrics, Beijing, China. Graduate School of Peking Union Medical College, Beijing, China. Population Cancer Research Program and Department of Pediatrics, Dalhousie University, Halifax, Canada. Department of Medicine and Therapeutics, Hong Kong Institute of Diabetes and Obesity and The Chinese University of Hong Kong-Prince of Wales Hospital-International Diabetes Federation Centre of Education, Hong Kong SAR, China. Chronic Disease Epidemiology Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana, United States of America. Division of Diabetes Translation, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America. Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, Tianjin, China.