Funding for this research was provided by:
National Research Foundation of Korea (NRF-2019R1C1C1010552)
Received: 1 October 2019
Accepted: 5 June 2020
First Online: 15 June 2020
Ethics approval and consent to participate
: The study was carried out in accordance with the Declaration of Helsinki and approved by the Institutional Review Board of the YUHS Clinical Trial Center (IRB No. 4–2016-0932). We obtained informed written consent from all participants.
: Not applicable.
: The authors have no conflicts of interest to declare.