Funding for this research was provided by:
Ministry of Health and Welfare (HI15C3227)
Received: 4 November 2019
Accepted: 17 April 2020
First Online: 15 May 2020
Ethics approval and consent to participate
: The present study protocol was reviewed and approved by the Institutional Review Board of National Medical Center (No. H-1510-059-007; 2015-10-22), Seoul National University Hospital (No. 1511–117-723; 2016-1-13), Chungnam National University Hospital (No. 2015–08–029-007; 2016-2-18), Seoul Medical Center (No. 2015–12-102; 2016-2-17), and Dankook University Hospital (No. 2016–02–014; 2016-4-8). Written informed consent was submitted by all subjects when they were enrolled.
: Not Applicable.
: The authors declare that they have no competing interests.