Article History
Received: 6 February 2022
Revised: 24 May 2022
Accepted: 30 May 2022
First Online: 18 June 2022
Declarations
:
: Subin Jeon, Seong Young Kwon, Sang-Woo Lee, and Sang Kyun Bae declare no competing interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the Helsinki declaration as revised in 2013 and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.
: This retrospective study was approved by the institutional review boards of each hospital involved and the requirement to obtain informed consent was waived.