1. Department of Obstetrics and Gynecology, Quanzhou First Hospital Affiliated to Fujian Medical University, QuanzhouFujian Province 362000PR China
2. Department of Obstetrics and Gynecology, Medical College of Nanchang University, 330031NanchangPR China
3. Department of Ultrasonography, Quanzhou First Hospital Affiliated to Fujian Medical University, QuanzhouFujian Province 362000PR China
4. Department of Radiology, Quanzhou First Hospital Affiliated to Fujian Medical University, QuanzhouFujian Province 362000PR China
5. No. 248 Dong RoadQuanzhouCity Fujian Province 362000PR China