Liu, Cong
Yang, Lin
Cheng, Yuwei
Xu, Hongmei
Xu, Feng
Article History
Received: 18 March 2020
Accepted: 21 October 2020
First Online: 16 November 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Regional Committee of Children’s Hospital Affiliated to Chongqing Medical University (File No. (2020)13) and the requirement for informed consent was waived due to the retrospective design of the study. The collected data was anonymized before its use.
: Not applicable.
: The authors declare that they have no competing interests.