Received: 9 May 2020
Accepted: 6 July 2020
First Online: 9 July 2020
Ethics approval and consent to participate
: This study was approved by the institutional review board of Fukuoka University Hospital (No. 18-11-03). Consent to participate in this study from each patient was waived by the review board due to the retrospective nature of this study.
: Not applicable.
: The authors declare that they have no competing interests.