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Authors
Yang, Yiting
Jin, Xin
Pan, Zhengxia
Li, Yonggang
Wu, Chun
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Article History
Received: 7 June 2019
Accepted: 15 August 2019
First Online: 9 September 2019
Ethics approval and consent to participate
: This research received ethical approval and consent. And it didn’t require the approval of an ethics committee.
: All infants’ information contained in this manuscript has been published with the consent of their parents.
: The authors declare that they have no competing interests.
