Funding for this research was provided by:
Science and Technology Commission of Shanghai Municipality (16ZR1430100, 20ZR1448000)
National Key Research and Development Program of China (2016YFC1000505, 2018YFC1002801)
Innovation-oriented Science and Technology Grant from NHC Key Laboratory of Reproduction Regulation (CX2017-06)
Received: 7 August 2020
Accepted: 13 November 2020
First Online: 26 November 2020
Ethics approval and consent to participate
: The study was approved by the ethical review committee of Shanghai Institute of Planned Parenthood Research (SIPPR). The study was conducted according to the Declaration of Helsinki. All mothers gave their written informed consent for themselves and their children before enrollment and at each follow-up.
: Not applicable.
: The authors declare that they have no competing financial interests.