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Article History

Received: 9 February 2018

Accepted: 2 July 2018

First Online: 18 July 2018

Ethics approval and consent to participate

: KNHANES was an annual survey conducted by the Research Ethics Review Committee of the KCDC (No. 2013-07CON-03-4C, No. 2013-12EXP-03-5C, No. 2015–01-02-6C). All personal identification information was deleted from the data before analysis. Participants in this survey provided their informed consent.

: Not applicable

: The authors declare that they have no competing interests.

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