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Authors
Pan, Jia Ping
Liang, Shan Shan
Huang, Mei Yuan
Zhao, Mei
Kong, Peng Cheng
Liu, Yi Ping
Teng, Xiao Ming
Wu, Hai Xia https://orcid.org/0000-0002-6034-6877
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Funding
Funding for this research was provided by:
Shanghai public health bureau (20114151)
National Family Planning Commission (C1-9)
Shanghai Family Planning Commission (2013JG07)
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Article History
Received: 23 April 2019
Accepted: 21 July 2021
First Online: 14 August 2021
Declarations
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: The authors declare that they have no conflict of interest.
: The study protocol was approved (2019-02) by the Ethics Committee of Shanghai First Maternity and Infant Hospital on January 1, 2019.
: Written informed consent was obtained from all participants included in the study.
