1. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Jinan University, Guangzhou, China
2. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, China
3. Department of Pathology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
4. Department of Surgery, Huaiyuan County Hospital of Traditional Chinese Medicine, Bengbu, China