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1Division of Endocrinology and Metabolism, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2Division of Health and Nutrition Survey, Korea Centers for Disease Control and Prevention, Cheongju, Korea.
3Division of Endocrinology and Metabolism, Department of Medicine, Thyroid Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4Department of Social and Preventive Medicine, Sungkyunkwan University School of Medicine, Suwon, Korea.
5Department of Surgery, Chungbuk National University College of Medicine, Cheongju, Korea.
6Department of Surgery, CHA Gangnam Medical Center, CHA University, Seoul, Korea.
Copyright © 2017 Korean Endocrine Society
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
CONFLICT OF INTEREST: No potential conflict of interest relevant to this article was reported.