Article History
Received: 7 September 2020
Accepted: 19 January 2021
First Online: 4 February 2021
Declarations
:
: The KNHANES conducted in 2014 and 2015 was approved by the Korean Centers for Disease Control and Prevention (KCDC) Institutional Review Board (No. 2013-12EXP-03-5C 2014 and 2015–01-02-6C), and written informed consent was obtained from all participants. After 2015, the KNHANES has been exempt from the ethics approval as the government of South Korea categorized the KNHANES as governmental research for public welfare.
: Written informed consent was obtained from all participants.
: All identifiable personal information in the current study was not available in the KNHANES data we used. Therefore, no consent was required regarding publishing their data and images/photographs.
: The authors declare no conflict of interest.