Affiliation: | 1. Department of Gynecology and Obstetrics, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China;2. Graduate School, Bengbu Medical College, Bengbu, China;3. Department of Gynaecology and Obstetrics, The Affiliated Huai'an Hospital of Xuzhou Medical College and The Second People's Hospital of Huai'an, Huai'an, Jiangsu, China |