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Article History
Received: 5 October 2023
Accepted: 21 February 2024
First Online: 1 March 2024
Declarations
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: This study was conducted in accordance with the Declaration of Helsinki (as revised in 2013) and was approved by the ethics committee of Beijing Chao-Yang District Maternal and Child Healthcare Hospital (No. 2011-LC-Ped-01). Informed consent was obtained from parents.
: Not applicable.
: The authors declare that they have no competing interests.
