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 Hubei China
2. Department of Epidemiology and Biostatistics West China School of Public Health and West China Fourth Hospital Sichuan University Chengdu China
3. Department of Obstetrics and Gynecology Shuangliu Maternal and Child Health Hospital Chengdu Sichuan China
4. Nutrition Department Shuangliu Maternal and Child Health Hospital Chengdu Sichuan China
5. Department of Emergency Hainan Clinical Research Center for Acute and Critical Diseases The Second Affiliated Hospital of Hainan Medical University Haikou Hainan China
6. Research Unit of Island Emergency Medicine Chinese Academy of Medical Sciences Hainan Medical University Haikou Hainan China
7. School of Public Health Hainan Medical University Haikou Hainan China
8. Department of Communicable Diseases Control and Prevention Shenzhen Center for Disease Control and Prevention Shenzhen Guangdong China
9. Department of Gynecology and Obstetrics West China Second Hospital State Key Laboratory of Biotherapy Sichuan University Chengdu Sichuan China
10. Department of Nutrition & Food Hygiene Tongji Medical College Huazhong University of Science and Technology Wuhan Hubei China
11. Key Laboratory of Emergency and Trauma of Ministry of Education Hainan Medical University Haikou Hainan China
12. Emergency Medicine Center Sichuan Provincial People's Hospital University of Electronic Science and Technology of China Chengdu Sichuan China
13. Division of Epidemiology Department of Medicine Vanderbilt University Medical Center Nashville Tennessee USA