1. Department of Obstetrics, Women's Hospital School of Medicine Zhejiang University, Hangzhou, Zhejiang 310006, P.R. China
2. Department of Endocrinology, Chinese PLA 903rd Hospital (Former Chinese PLA 117th Hospital), Hangzhou, Zhejiang 310013, P.R. China
3. School of Life Sciences, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China