Funding for this research was provided by:
Text and Data Mining valid from 2018-07-16
Received: 8 November 2017
Accepted: 9 July 2018
First Online: 16 July 2018
Ethics approval and consent to participate
: The KNHANES was approved by the Institutional Review Board of the Korea Centers for Disease Control and Prevention (KCDC), and written consent was obtained from all participants.
: Not applicable.
: The author declare that he has no competing interests.
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