Liancheng Zhu1, Wei Zhao, Yu Shi, Bei Lin. 1. Departments of Obstetrics and Gynecology, Shengjing Hospital Affiliated to China Medical University, Shenyang, ChinaDepartments of Pathology, Shengjing Hospital Affiliated to China Medical University, Shenyang, ChinaDepartments of Radiology, Shengjing Hospital Affiliated to China Medical University, Shenyang, China.