Funding for this research was provided by:
Ministry of Health and Welfare (HB16C0028)
Text and Data Mining valid from 2018-11-19
Received: 5 February 2018
Accepted: 29 October 2018
First Online: 19 November 2018
Ethics approval and consent to participate
: The survey of KNHANES phase IV and V were approved by KCDC Research Ethics Review Committee (Approval No. 2008-04EXP-01-C, 2009-01CON-03-2C, 2010-02CON-21-C, 2011-02CON-06-C, 2012-01EXP-01-2C).
: Not applicable
: The authors declare that they have no competing interests.
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