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Authors
Dong, Yulei
Tang, Ning
Wang, Shengru
Zhang, Jianguo
Zhao, Hong https://orcid.org/0000-0003-1717-1220
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Article History
Received: 31 July 2020
Accepted: 9 December 2020
First Online: 5 January 2021
Ethics approval and consent to participate
: This retrospective study without intervention was approved by Peking Union Medical College Hospital Ethical Committee. A written informed consent was obtained from a parent or guardian for participants under 16 years old when admitted into ward about medical records for scientific use.
: Not Applicable.
: NA
