Received: 25 June 2019
Accepted: 5 May 2021
First Online: 17 May 2021
: This retrospective study was reviewed and approved by the Institutional Ethics Committee from The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, China. The Medical Department of Second Affiliated Hospital and Yuying Children’s Hospital authorized us to access and use these medical records. As this was a retrospective study, written consent to participate from the study subjects was not required.
: Not applicable.
: The authors declare no conflicts of interest or competing interests.