Funding for this research was provided by:
Samsung Medical Center Grant (SMO1190081)
Received: 3 July 2020
Revised: 8 December 2020
Accepted: 17 December 2020
First Online: 18 January 2021
Compliance with ethical standards
: The scientific guarantor of this publication is Sung Yoon Park, M.D.
: 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• cross sectional study• performed at one institution