Affiliation: | 1. Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, Tianjin, China;2. Department of Women Health, Tianjin Women and Children's Health Center, Tianjin, China;3. Nankai District Women and Children's Health Center, Tianjin, China;4. Heping District Women and Children's Health Center, Tianjin, China;5. Department of Medicine and Therapeutics, Hong Kong Institute of Diabetes and Obesity, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China |