1. Department of Medical Record Management, West China Second University Hospital, Sichuan University, Chengdu 610041, China
2. Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu 610041, China
3. School of Public Health, Chongqing Medical University, Chongqing 400016, China
4. Research Center for Medicine and Social Development, Chongqing Medical University, Chongqing 400016, China
5. Chongqing Shapingba District Center for Disease Control and Prevention, Chongqing 400030, China
6. College of Medical Informatics, Chongqing Medical University, Chongqing 400016, China