Received: 9 September 2020
Accepted: 26 November 2020
First Online: 2 December 2020
Ethics approval and consent to participate
: The protocol of the present study was approved by the ethics committee of the National Hospital Organization Mie Chuo Medical Center. Because this study was a retrospective case-control study, consent was obtained from each patient using an opt-out document posted on the website of the Mie Central Medical Center.
: Not applicable.
: The authors declare that they have no competing interests.