Received: 16 November 2020
Accepted: 7 April 2021
First Online: 4 May 2021
: The original study was performed with the approval of the Institutional Review Board (IRB) at Seoul National University Hospital (approval no. H-1807-131-961). All participants provided written informed consent prior to participation and were informed that they could withdraw their consent at any time without any disadvantage. For the current secondary data analysis, data were received from the principle investigator of the original study after obtaining approval from the IRB at the Seoul National University (approval no. E2011/001–003). All methods were performed in accordance with the relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.