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Authors
Yi, Zhi
Zhang, Ying
Song, Zhenfeng
Pan, Hong
Yang, Chengqing
Li, Fei
Xue, Jiao
Qu, Zhenghai https://orcid.org/0000-0002-4684-8651
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Funding
Funding for this research was provided by:
Qingdao science and technology project (20-4-1-5-nsh)
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Article History
Received: 18 March 2020
Accepted: 8 June 2020
First Online: 9 July 2020
Ethics approval and consent to participate
: Study approval and ethical clearance was obtained from the affiliated hospital of Qingdao university. Written consent was obtained from the guardian of the child prior to data collection.
: We obtained the written consent for publication from the guardian of the patient.
: All authors declare that they do not have any conflict of interest.
