1 Department of Obstetrics, Center for Reproductive Medicine (Dr. Zhang), Zhejiang Provincial People's Hospital (People's Hospital of Hangzhou Medical College), Hangzhou, China.
2 Department of Gynecology, Zhejiang Provincial People's Hospital Tongxiang Branch (Dr. Huihua Wang), Jiaxing, China.
3 Department of Gynecology, Center for Reproductive Medicine (Drs. Han and Wang), Zhejiang Provincial People's Hospital (People's Hospital of Hangzhou Medical College), Hangzhou, China.
4 Department of Radiology, Zhejiang Provincial People's Hospital (People's Hospital of Hangzhou Medical College) (Dr.Chen), Hangzhou, China.
5 Department of Gynecology, Center for Reproductive Medicine (Drs. Han and Wang), Zhejiang Provincial People's Hospital (People's Hospital of Hangzhou Medical College), Hangzhou, China. Electronic address: wangyanpeng@hmc.edu.cn.