1. Department of Reproductive Medicine, Affiliated Jinling Hospital, Clinical School of Medical College, Nanjing University, Nanjing, Jiangsu, China
2. School of Software Engineering, Jinling Institute of Technology, Nanjing, Jiangsu, China
3. Department of Ultrasound Diagnosis, Nanjing Jinling Hospital, Nanjing University School of Medicine, Nanjing, Jiangsu Province, China