Funding for this research was provided by:
Ministry of Trade, Industry and Energy (10075266)
Article History
Received: 13 April 2020
Accepted: 4 January 2021
First Online: 2 March 2021
Ethics approval and consent to participate
: The study protocol was approved by the ethics committee of Severance Cardiovascular Hospital. The written consent was obtained from all participants.
: Not applicable.
: All authors declare that they have no competing interests.