Acknowledgements:
This study was presented at the Annual Meeting of the Society for Maternal-Fetal Medicine (SMFM), January 2020 (Poster # 888).
Disclosure of Interests: The authors report no financial interest. The authors report no conflict of interest.Contribution to Authorship:Conception: RL, YZ, YG, DV Planning: EM, RB, ZW, YG Carrying out: RL, CB, GB, NJ Analysing: RL, NJ, YZ, DV Writing of work: RL, CB, YZ, RBDetails of Ethics Approval:
The study was approved by our local Research Ethics Board (0361-19-RMB), on: December 2nd , 2019.