1. Department of Epidemiology and Biostatistics, School of Public Health; Tianjin Medical University; Tianjin China
2. Center for Disease Control and Prevention of Tianjin Economic-Technological Development Area; TEDA; Tianjin China
3. Tianjin Women and Children's Health Centre; Tianjin China
4. Department of Medicine and Therapeutics, Prince of Wales Hospital, and the Hong Kong Institute of Diabetes and Obesity; The Chinese University of Hong Kong; Hong Kong China