1. Department of Genetics, Zhejiang University School of Basic Medical Sciences, Hangzhou, Zhejiang 310058, P.R. China
2. Department of Central Laboratory, Ningbo First Hospital, Zhejiang University School of Medicine, Ningbo, Zhejiang 315035, P.R. China
3. Department of Obstetrics and Gynecology, Ningbo First Hospital, Zhejiang University School of Medicine, Ningbo, Zhejiang 315035, P.R. China