Article History
Received: 22 April 2019
Accepted: 20 September 2019
First Online: 26 October 2019
Ethics approval and consent to participate
: The VI-1, VI-2, and VI-3 versions of the KNHANES were approved by the Institutional Review Board of the Korea Center for Disease Control and Prevention (approval no. 2013-07CON-03-4C, 2013-12EXP-03-5C, and 2015-01-02-6C). Each participant voluntarily participated and provided a written informed consent before participating in the study. Additionally, the institutional review board (IRB) of the Jaseng Hospital of Korean Medicine waived approval because the KNHANES survey data are openly published. The informed consent was not required, as their information is fully anonymized and unidentified prior to analysis (JASENG 2018–12-001).
: Not applicable.
: The authors declare that they have no competing interests.