Article History
Received: 25 June 2020
Revised: 2 November 2020
Accepted: 19 November 2020
First Online: 6 January 2021
Compliance with ethical standards
:
: The scientific guarantor of this publication is Osamu Sakai.
: 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.
: No complex statistical methods were necessary for this paper.
: Written informed consent was waived by the Institutional Review Board.
: Institutional Review Board approval was obtained.
: • retrospective• diagnostic or prognostic study• multicenter study