Funding for this research was provided by:
Korea Centers for Disease Control and Prevention
Text and Data Mining valid from 2020-05-04
Received: 11 February 2020
Accepted: 24 April 2020
First Online: 4 May 2020
Ethics approval and consent to participate
: The KNHANES was approved by the Institutional Review Board of the Korea Centers for Disease Control (IRB No. 1401–047-547), and all participants signed an informed consent form. This study meets the Helsinki Declaration-based ethical principles for medical research involving human subjects.
: Not applicable.
: The authors declare that they have no competing interests.