1 Department of Radiology, West China Second University Hospital, Sichuan University, 610041 Chengdu, Sichuan, China.
2 Huaxi MR Research Center (HMRRC), Department of Radiology, West China Hospital of Sichuan University, 610041 Chengdu, Sichuan, China.
3 Department of Gynecology and Obstetrics, West China Second University Hospital, Sichuan University & Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, 610041 Chengdu, China.