Funding for this research was provided by:
NATIONAL HEALTH INSURANCE SERVICE ILSANHOSPITAL (NHIMC 2016-20-016)
Received: 17 December 2019
Accepted: 18 October 2020
First Online: 27 October 2020
Ethics approval and consent to participate
: The Institutional Review Board of the National Health Insurance Service Ilsan Hospital approved this study (NHIMC 2019-04-033). Written informed consent was exempted by the Institutional Review Board.
: Not applicable.
: The authors declare that they have no competing interests.