1. Graduate School of Medicine, Changzhi Medical College, Changzhi, PR China
2. Department of Gynecology, Yuncheng Central Hospital, The Affiliated Hospital of Shanxi Medical University, Shanxi, PR China
3. Department of Anesthesiology, Heji Hospital Affiliated to Changzhi Medical College, Changzhi, PR China
4. Department of Central Laboratory, Changzhi People’s Hospital, The Affiliated Hospital of Shanxi Medical University, Changzhi, PR China
5. Department of Gynecology, Changzhi People’s Hospital, The Affiliated Hospital of Shanxi Medical University, Changzhi, PR China
6. Department of Gastrointestinal Surgery, Changzhi People’s Hospital, The Affiliated Hospital of Shanxi Medical University, Changzhi, PR China