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Article History

Received: 6 June 2019

Accepted: 13 December 2019

First Online: 19 December 2019

Compliance with ethical standards

:

: The authors declare they have no competing interests.

: All participants participated in the survey voluntarily and provided written informed consent for the data collection. The Institutional Review Board of the Korea Center for Disease Control and Prevention reviewed and approved the KNHANES (IRB Nos. 2008-04EXP01-C, 2009-01CON-03-2C, 2010-02CON-21, 2011-02CON-06-C, and 2013-12EXP-03-5C). The Ansan-Ansung study protocol was reviewed and approved by the Institutional Review Board of the Korea Centers for Disease Control and Prevention, and all study participants signed written informed consent documents. This study was approved by the Institutional Review Board of Gangnam Severance hospital (IRB number: 3–2019-0070).