Received: 22 December 2020
Accepted: 17 June 2021
First Online: 6 July 2021
: These datasets were approved by the Institutional Review Board of the National Medical Center in Korea (IRB No. H-1604-065-003). Because the datasets were fully anonymized in regard to identifying personal information, informed consent was not required. Protocols are carried out in accordance with relevant guidelines and regulations. The data used in this study are not publicly available and do not contain personal identifying information.
: Not applicable.
: The author declares that there are no competing interests.