Acknowledgments
The authors would like to acknowledge support from the “111 program” of the Ministry of Education PRC and the State Administration of Foreign Experts Affairs PRC. This work was financially supported by the National Key Research and Development Program of Reproductive Health & Major Birth Defects Control and Prevention (No. 2016YFC1000407), the National Natural Science Foundation of China for Youth (81601304), the Key Program of International Cooperation of NSFC (81520108013), the Ph.D. Programs Foundation of the Ministry of Education of China (2013550311003), and the General Program of the National Natural Science Foundation of China (81471472).
Data sharing
The data used and analyzed during the current study are available from the corresponding author on reasonable request.