Funding for this research was provided by:
Korea Health Industry Development Institute (HI19C1129)
Article History
Received: 20 September 2020
Revised: 23 December 2020
Accepted: 21 January 2021
First Online: 8 February 2021
Compliance with ethical standard
:
: The scientific guarantor of this publication is Jin Mo Goo.
: No authors have 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• observational• performed at one institution