1. Clinical Experimental Teaching Center, The First Affiliated Hospital of Xi’an Medical University, Xi’an 710077, Shaanxi, China
2. Department of Gynaecology, Shaanxi Provincial People’s Hospital, Xi’an 710068, Shaanxi, China
3. Department of Neurology, The First Affiliated Hospital of Xi’an Medical University, Xi’an 710077, Shaanxi, China
4. Department of Gynaecology and Obstetrics, The First Affiliated Hospital of Xi’an Medical University, Xi’an 710077, Shaanxi, China