Funding for this research was provided by:
National Natural Science Foundation of China (No.81741013)
National Key Research and Developmental Program of China (2018YFC1004800, 2018YFC1004802)
Shanghai Municipal Council for Science and Technology (18410721200)
Shanghai Municipal Education Commission- Gaofeng Clinical Medicine Grant Support (20152236)
the Opening Fund of Key Laboratory of the diagnosis and treatment research of reproductive disorders of Zhejiang Province (No. 2018001)
Text and Data Mining valid from 2019-08-14
Received: 6 June 2019
Revised: 23 July 2019
Accepted: 1 August 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Ethics Committee of the International Peace Maternity and Child Health Hospital (Shanghai, China), and written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.