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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, 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, Korea
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