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Authors
Liu, Wen
Yan, Xuejing
Li, Chengyu
Shu, Qi
Chen, Meng
Cai, Le
You, Dingyun
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Article History
Received: 21 March 2021
Accepted: 5 October 2021
First Online: 19 October 2021
Declarations
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: The study was conducted according to the guidelines of the Declaration of Helsinki and approved by the Institutional Review Board of the Chinese Association of Maternal and Child Health Studies (No. AMCHS-2014-4). Informed consent was obtained from all subjects involved in the study.
: Not applicable.
: The authors declare no competing interests.
