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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 Endocrinology and Metabolism, Department of Medicine, Thyroid Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea.
4Division of Endocrinology and Metabolism, Department of Internal Medicine, Biomedical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
5Department of Internal Medicine, Chungnam National University Hospital, Chungnam National University School of Medicine, Daejeon, Korea.
6Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
7Division of Endocrinology, Department of Medicine, Gyeongsang National University Changwon Hospital, Gyeongsang National University School of Medicine, Changwon, 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.
CONFLICTS OF INTEREST: No potential conflict of interest relevant to this article was reported.
TNM stage was determined by the 7th American Joint Committee on Cancer TNM staging system.
HR, hazard ratio; CI, confidence interval; PTC, papillary thyroid cancer; FTC, follicular thyroid cancer; LN, lymph node; TNM, tumor node metastasis.
aIn multivariate analysis #1, we used age at diagnosis, sex, pathology, primary tumor size, presence of extrathyroidal extension, cervical LN metastasis, and distant metastasis as possible risk factors; bIn multivariate analysis #2, we used age at diagnosis, sex, pathology, primary tumor size, presence of extrathyroidal extension, and TNM staging as possible risk factors.