Xinggui Liao1,2, Huan Yang1,2, Junfeng Kong2,3, Hongbing Yang1,2
1Clinic of Obstetrics and Gynecology, Chongqing Three Gorges Central Hospital, Chongqing, China
2Chongqing University Three Gorges Hospital, Chongqing, China
3Clinic of Radiology, Chongqing Three Gorges Central Hospital, Chongqing, China