1. Yanfang Ren:
Department of Obstetrics & Gynecology, The First Affiliated Hospital of Xinxiang Medical University, No. 88 Jiankang Road, Weihui 453100, China
2. Huiling Wang:
Department of Obstetrics & Gynecology, The First Affiliated Hospital of Xinxiang Medical University, Weihui 453100, China
3. Haixia Qin:
Department of Obstetrics & Gynecology, The First Affiliated Hospital of Xinxiang Medical University, Weihui 453100, China
4. Jun Yang:
Department of Obstetrics & Gynecology, The First Affiliated Hospital of Xinxiang Medical University, Weihui 453100, China
5. Yuhong Wang:
Department of Obstetrics & Gynecology, The First Affiliated Hospital of Xinxiang Medical University, Weihui 453100, China
6. Shan Jiang:
Department of Obstetrics & Gynecology, The First Affiliated Hospital of Xinxiang Medical University, Weihui 453100, China
7. Ying Pan:
The Third First Affiliated Hospital of Xinxiang Medical University, Xinxiang, China