1. Prevention and Health Department, Xinzhuang Community Health Service Center, Shanghai, China
2. Department of Epidemiology, Ministry of Education Key Laboratory of Public Health Safety, Fudan University School of Public Health, Shanghai, China
3. Obstetrics and Gynecology, Minhang District Central Hospital, Shanghai, China
4. Comprehensive Prevention and Control Office, Minhang District Center for Disease Control and Prevention, Shanghai, China