Author Contributions
Kazunori Aoki: conceptualization, data curation, formal
analysis, investigation, writing – original draft
Hiroshi Kurosawa: conceptualization, methodology, writing –
review & editing
Yusuke Seino: conceptualization
Keiichi Morita: resources, data curation
Hironori Matsuhisa: writing – review & editing
Yoshihiro Oshima: writing – review & editing
Ethical approval: This study was approved by the Institutional
Review Board of Hyogo Prefectural Kobe Children’s Hospital (No. R2-8;
September 2, 2020). The requirement for informed consent was waived
because of the retrospective design.
Data Availability: The data that support the findings of this
study are available from the corresponding author, KA, upon reasonable
request.