1. Department of Obstetrics Linyi Central Hospital Linyi China
2. Intensive Care Unit, Linyi Central Hospital Linyi China
3. Department of Obstetrics and Gynecology Economic and Technological Development Zone People's Hospital of Linyi Linyi China
4. Operating Room, Economic and Technological Development Zone People's Hospital of Linyi Linyi China
5. Department of General Surgery Linyi Central Hospital Linyi China
6. Medical Insurance Management Office, Economic and Technological Development Zone People's Hospital of Linyi Linyi China
7. Department of Gynecology Linyi People's Hospital Linyi China