Funding for this research was provided by:
National Research Foundation of Korea Grant (NRF-2017M3A9E9072939)
SNUH Research Fund (04-2018-0590)
Article History
Received: 12 October 2020
Accepted: 22 February 2021
First Online: 9 March 2021
Competing interests
: The authors declare no competing interests<b>.</b>