1. Department of Radiology; Longgang District Central Hospital of Shen Zhen; Shenzhen, Guangdong Province; P.R. China
2. Department of Gynaecology and Obstetrics; Longgang District Central Hospital of Shen Zhen; Guangdong Province; P.R. China
3. Department of Radiology; The Xiangya Hospital, Central South University; Changsha, Hunan Province; P.R. China