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Article History

Received: 26 March 2020

Accepted: 25 August 2020

First Online: 29 August 2020

Ethics approval and consent to participate

: All participants signed a written informed consent form and the protocols for KNHANES were approved by the Institutional review board of the Korean Centers for Disease Control and Prevention (KCDC).

: Our manuscript contains no individual person’s data in any form.

: The authors declare that they have no competing interests.