1. Department of Epidemiology and Biostatistics, Ministry of Education Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College Huazhong University of Science and Technology Wuhan China
2. Department of Epidemiology and Biostatistics, West China School of Public Health and West China Fourth Hospital Sichuan University Chengdu China
3. Section of Epidemiology and Population Health & Department of Gynecology and Obstetrics, Ministry of Education Key Laboratory of Birth Defects and Related Diseases of Women and Children & National Medical Products Administration Key Laboratory for Technical Research on Drug Products In Vitro and In Vivo Correlation, West China Second University Hospital Sichuan University Chengdu China
4. Department of Science and Education Shuangliu Maternal and Child Health Hospital Chengdu China
5. Antenatal Care Clinics Shuangliu Maternal and Child Health Hospital Chengdu China
6. Department of Emergency, Hainan Clinical Research Centre for Acute and Critical Diseases The Second Affiliated Hospital of Hainan Medical University Haikou China
7. School of Public Health Hainan Medical University Haikou Hainan China
8. Research Unit of Island Emergency Medicine, Chinese Academy of Medical Sciences Hainan Medical University Haikou China
9. Emergency Medicine Centre, Sichuan Provincial People's Hospital University of Electronic Science and Technology of China Chengdu China
10. Key Laboratory of Emergency and Trauma of Ministry of Education Hainan Medical University Haikou China
11. Department of Nutrition & Food Hygiene, Tongji Medical College Huazhong University of Science and Technology Wuhan China
12. Shuangliu Institute of Women's and Children's Health Shuangliu Maternal and Child Health Hospital Chengdu China
13. Centre for Epidemiology and Population Health, Integrated Traditional Chinese and Western Medicine Institute & Chengdu Integrated Traditional Chinese and Western Medicine Hospital Chengdu University of Traditional Chinese Medicine Chengdu China