Funding for this research was provided by:
National Research Foundation of Korea (2018R1A2B2007997)
Jeju national university hospital development fund in 2016
Received: 2 September 2020
Accepted: 6 January 2021
First Online: 25 January 2021
Ethics approval and consent to participate
: Written consent was obtained from all participants, and the study protocol was approved by the institutional review board of Jeju National University Hospital (2016-07-011).
: Not applicable.
: The authors declare no conflict of interest.