1. Department of Gynecology and Obstetrics; Tongji Hospital; Tongji Medical College; Huazhong University of Science and Technology; Wuhan Hubei China
2. Department of Gynecology and Obstetrics; Northern Jiangsu Province Hospital; Clinical Medical College; Yangzhou University; Jiangsu China
3. Faculty of Reproductive Medical Center of the Third Hospital; Zhengzhou University; Zhengzhou Henan China
4. Department of Reproductive Medical Center; Tangdu Hospital; The Fourth Military Medical University; xi'an China
5. Faculty of Department of Orthopedics; Pu Ai Hospital; Tongji Medical College; Huazhong University of Science and Technology; Wuhan China