Received: 6 October 2021
Accepted: 29 January 2022
First Online: 17 February 2022
: No financial or personal conflicts of interest in relation to the submission of this paper, other people, or any organizations.
: This retrospective chart review study involving human participants was in accordance with the ethical standards of the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The Institutional Review Board (IRB) at Korea University (0816A2 and 1225A3) approved this study. We thank Dr. WH Park and graduate students at Korea University for their critical analyses of the important intellectual content and interpretation of data.
: Informed consent form was required for this type of study.