Funding for this research was provided by:
National Research Foundation of Korea (1801000565)
Received: 5 July 2020
Accepted: 2 February 2021
First Online: 18 February 2021
Ethics approval and consent to participate
: The KoGES study protocol was reviewed and approved by the Institutional Review Board of the KCDC, and all study participants submitted written informed consent. This research was approved by the institutional review board of Jeonbuk National University (JBNU 201803019). The KCDC provided the raw data after reviewing our study’s plans and IRB approval (included in the InternalRef removed section).
: Not applicable.
: The authors declare that they have no competing interests.