1. Department of Emergency Surgery, Lu'an People's Hospital of Anhui Province, Lu'an, Anhui, China
2. Department of Obstetrics and Gynaecology, Affiliated Hospital of Tongchuan City Maternal and Child Health Care, Tongchuan, Shaanxi, China
3. School of Nursing, Anhui University of Chinese Medicine, Hefei, Anhui, China
4. Department of Pathology, Shaanxi Provincial People's Hospital, Xi'an, Shaanxi, China
5. Graduate Student Affairs Office, Xi’an Medical University, Xi’an, Shaanxi, China