Cardiovascular Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, China;
Nursing Department, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, China;
Cardiovascular Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, China;
Cardiovascular Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, China;
Obstetrics Department, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, China;
Gynecology Department, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, China;
Cardiovascular Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, China;
Cardiovascular Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, China;