Funding for this research was provided by:
Basic Science Research Program of the National Research Foundation of Korea [NRF] funded by the Ministry of Science, ICT & Future Planning (2019R1F1A1060131)
Article History
Received: 19 June 2019
Revised: 1 October 2019
Accepted: 21 October 2019
First Online: 28 November 2019
Compliance with ethical standards
:
: The scientific guarantor of this publication is Se Hyung Kim.
: 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• observational• performed at one institution