Affiliation: | 1.Department of Obstetrics and Gynecology, Ningbo First Hospital, Ningbo, Zhejiang 315035, P.R. China;2.Department of Laboratory Medicine, Ningbo Yinzhou No. 2 Hospital, Ningbo, Zhejiang 315100, P.R. China;3.Department of Laboratory Medicine, Henan Provincial People''s Hospital, Zhengzhou, Henan 450003, P.R. China |