Article History
Received: 13 November 2019
Accepted: 17 July 2020
First Online: 25 July 2020
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: No outside funding or financial support was received to undertake this study.
: Ethical approval was obtained from the Kyung Hee University Hospital Institutional Review Board (KHUH 2019-08-014) prior to the start of the study.
: Formal consent was not required for this retrospective study.