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Authors
Dong, Dingding
Ru, Xifang
Huang, Xiaofang
Sang, Tian
Li, Shan
Wang, Ying
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Article History
Received: 12 October 2020
Accepted: 26 December 2021
First Online: 10 January 2022
Declarations
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: The study protocol was approved by the Institutional Review Board of Peking University First Hospital (project identification code: 2018–88; date of approval: 23 May 2018). Written informed consent was obtained from all participating mothers.
: Not applicable.
: None.
