Funding for this research was provided by:
Korea Health Industry Development Institutde (HI19C0373)
Received: 25 May 2020
Accepted: 9 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: We obtained approval from the Institutional Review Board (IRB) of Seoul National University Bundang Hospital (No. X-1907-555-904), and conducted the study in accordance with the tenets of the Declaration of Helsinki. The IRB approved a waiver of informed consent.
: Not applicable.
: The authors declare that they have no competing interests.