1. Department of Ultrasound Medicine, The First Affiliated Hospital of University of South China, Hengyang, Hunan, PR China
2. Department of Gynecology, Xiangya Hospital, Central South University, Changsha, Hunan, PR China
3. Department of Obstetrics & Gynecology, The First Affiliated Hospital of University of South China, Hengyang, Hunan, PR China
4. Department of Obstetrics & Gynecology, Yi Yang Central Hospital, Yiyang, Hunan, PR China
5. Hunan Cancer Hospital, Changsha, Hunan, PR China
6. Scientific Information Management & Analysis Department, Hunan Warm Medical Technology Co. LTD, Loudi, Hunan, PR China
7. Xiangya Medical Laboratory, Central South University, Changsha, Hunan, PR China
8. The First Affiliated Hospital/School of Clinical Medicine of Guangdong Pharmaceutical University, Guangdong, PR China