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Authors
Du, Li
La, Xuena
Zhu, Liping
Jiang, Hong
Xu, Biao
Chen, An
Li, Mu
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Article History
Received: 15 December 2020
Accepted: 7 June 2021
First Online: 7 July 2021
Declarations
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: The research was approved by the Ethics Committee of Shanghai Maternal and Child Health Center (2017-F001–04). All participants were informed about the study procedure and provided written informed consent. All methods were performed in accordance with the relevant guidelines and regulations (Declaration of Helsinki).
: No applicable.
: The authors declare that they have no competing interests.
