1. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning, China
2. Department of Internal Medicine, Zigong Fourth People’s Hospital, Zigong, Sichuan, China
3. Department of Obstetrics and Gynecology, Xuanwu Hospital, Capital Medical University, Beijing, China
4. Department of Oncology, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning, China
5. Operating Rooms, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning, China