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Department of Endocrinology and Metabolism, Kyung Hee University School of Medicine, Seoul, Korea
©2021, Korean Society of Epidemiology
This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
CONFLICT OF INTEREST
The author has no conflicts of interest to declare for this study.
FUNDING
None.
AUTHOR CONTRIBUTIONS
All work was done by SYR.