Funding for this research was provided by:
National Natural Science Foundation of China (81501702, 81471126)
Natural Science Foundation of Zhejiang Province (LY15H150007)
Text and Data Mining valid from 2019-12-31
Received: 6 March 2019
Accepted: 19 December 2019
First Online: 31 December 2019
Ethics approval and consent to participate
: The Ethical Committee of the Women’s Hospital, Zhejiang University School of Medicine (Hangzhou, China) approved the study on April 5, 2018. The reference number is No. 20180010. The written informed consent from all parturients participated in the present study were obtained.
: Not applicable.
: The authors declare that they have no competing interests.