Article History
Received: 30 December 2021
Accepted: 11 February 2022
First Online: 21 March 2022
Declarations
:
: This study was approved by the Institutional Review Board of the KCDC (IRB No. 2008-04EXP-01-C in 2008; 2009-01CON-03-2C in 2009; 2010-02CON-21-C in 2010; 2011-02CON-06-C in 2011). All participants provided written informed consent.
: Not applicable.
: All authors declare no competing interests.