Received: 10 July 2020
Revised: 8 October 2020
Accepted: 17 November 2020
First Online: 6 January 2021
Compliance with ethical standards
: The scientific guarantor of this publication is Naoki Omachi.
: The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.
: Masahiko Hara kindly provided statistical advice for this manuscript.
: Written informed consent was obtained from all patients in this study.
: Institutional Review Board approval was obtained.
: • prospective• observational• performed at one institution