Funding for this research was provided by:
Ministry of Health and Welfare (HI16C1151)
Received: 20 December 2019
Accepted: 6 August 2020
First Online: 21 August 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Seoul National University Hospital Institutional Review Board prior to the start of the study. All participants provided informed, written consent.
: Not applicable.
: The authors declare that they have no competing interests.