Received: 20 February 2021
Accepted: 14 June 2021
First Online: 30 June 2021
: The research protocol of this retrospective study was in compliance with the Helsinki Declaration. The institutional review board of Osaka Saiseikai Nakatsu Hospital approved this study. Informed consent was obtained from all patients who participated in this study.
: Not applicable.
: The authors declare no conflicts of interest associated with this manuscript.