Chongqing Institute of Accident & Emergency Medicine, Chongqing Emergency Medical Center, Chongqing 400014, China;
Chongqing Health and Family Planning Commission, Chongqing 401147, China;
Chongqing Health and Family Planning Commission, Chongqing 401147, China;
Chongqing Health Center for Women and Children, Chongqing 400010, China;
Chongqing Health and Family Planning Commission, Chongqing 401147, China;
First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China;
Chongqing Institute of Accident & Emergency Medicine, Chongqing Emergency Medical Center, Chongqing 400014, China;