1. Obstetrics Department, Chengyang District People’s Hospital, Qingdao, Shandong, China
2. Department of Blood Purification, The Third People’s Hospital of Qingdao, Qingdao, Shandong, China
3. Operating Room, Chengyang District People’s Hospital, Qingdao, Shandong, China
4. Blood Purification Department, Qingdao Hospital of Traditional Chinese Medicine (Qingdao Hiser Hospital), Qingdao, Shandong, China