Article History
Received: 5 July 2020
Accepted: 27 July 2020
First Online: 2 August 2020
Conflict of interest
: The authors declare that they have no conflict of interest and did not receive any financial support for the research, authorship, and/or publication of this article.
: This study was approved by the institutional review board (IRB) of the Korea Centers for Disease Control and Prevention (IRB approval numbers: 2008- 04EXP-01-C, 2009-01CON-03-2C, 2010-02CON-21-C, 2011-02CON-06-C, and 2012-01EXP-01-2C).
: This study is has not been previously published whole or in part, and is not under consideration for publication elsewhere. Written informed consent was obtained from all participants before enrollment. All authors have read the manuscript, agree the work is ready for submission to a journal, and accept responsibility for the manuscript's contents.
: The Korea National Health and Nutrition Examination Survey (KNHANES) continuous data used in the study is available publicly at Korea Centers for Disease Control and Prevention (KCDC) website at: ExternalRef removed