Department of Internal Medicine, Dankook University College of Medicine¹, Cheonan, Department of Internal Medicine, Chungbuk National University Hospital, Chungbuk National University College of Medicine², Cheongju, Department of Internal Medicine, Chungnam National University College of Medicine³, Daejeon, Department of Internal Medicine, Korea University College of Medicine⁴, Seoul, Department of Internal Medicine, Pusan National University School of Medicine⁵, Busan, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine⁶, Department of Internal Medicine, Seoul National University College of Medicine⁷, Seoul, Department of Internal Medicine, Seoul National University Bundang Hospital⁸, Seongnam, Department of Internal Medicine, Chonnam National University Medical School⁹, Gwangju, Department of Internal Medicine, Center for Thyroid Cancer, National Cancer Center¹⁰, Goyang, Department of Internal Medicine, College of Medicine, The Catholic University of Korea¹¹, Seoul, Daegu Endo Internal Medicine Clinic¹², Daegu, Department of Medicine and Thyroid Center, Samsung Medical Center, Sungkyunkwan University School of Medicine¹³, Department of Internal Medicine, Chung-Ang University College of Medicine¹⁴, Department of Internal Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center¹⁵, Seoul, Korea

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