1. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, 1 East Jianshe Road, Zhengzhou, China
2. Division of Spine, Department of Orthopedics, Tongji Hospital Affiliated to Tongji University School of Medicine, 389 Xincun Road, Shanghai, China
3. Tongji University School of Medicine, 1239 Siping Road, Shanghai 200092, China
4. School of Ocean and Earth Science, Tongji University, 1239 Siping Road, Shanghai 200092, China
5. Department of Gynaecology, Tongji Hospital Affiliated to Tongji University School of Medicine, 389 Xincun Road, Shanghai, China
6. Department of Orthopedics, Shanghai General Hospital, School of Medicine, Shanghai Jiaotong University, 100 Haining Road, Shanghai, China
7. Tongji University Cancer Center, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, 301 Yanchang Road, Shanghai 200072, China
8. Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, 1 East Jianshe Road, Zhengzhou, China