Received: 10 February 2021
Accepted: 28 April 2021
First Online: 5 May 2021
: All methods were performed in accordance with the Declaration of Helsinki. The present study was approved by the Institutional Ethical Board of Tokai University Hospital. The requirement for informed consent was waived by the Institutional Ethical Board of Tokai University Hospital due to the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.