Article History
Received: 31 March 2020
Revised: 19 May 2020
Accepted: 1 June 2020
First Online: 8 June 2020
Compliance with ethical standards
:
: No conflicting relationship exists for any author.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Institutional Review Board (IRB) of Samsung Medical Center and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: The IRB of Samsung Medical Center approved the waiver of informed consent in this study.
: Not applicable.