1. Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Korea.
2. Department of Family Medicine, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
3. Department of Family Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
4. Division of Endocrinology & Metabolism, Department of Medicine, Thyroid Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
5. Department of Radiology, Human Medical Imaging & Intervention Center, Seoul, Korea.
6. Department of Internal Medicine, Center for Thyroid Cancer, National Cancer Center, Goyang, Korea.
7. Division of Breast and Endocrine Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
8. Graduate School of Cancer Science and Policy, National Cancer Center, Goyang, Korea.
9. Department of Otorhinolaryngology Head and Neck Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
10. Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
11. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea.
12. Department of Otorhinolaryngology Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea.
13. Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
14. Department of Preventive Medicine and Public Health, Ajou University School of Medicine, Suwon, Korea.
15. Specific Organs Cancer Branch, Center for Thyroid Cancer, Research Institute & Hospital, National Cancer Center, Goyang, Korea.
16. Department of Family Medicine, Hallym University Dontan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea.
17. Department of Occupational & Environmental Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea.
18. National Cancer Control Institute, National Cancer Center, Goyang, Korea.
19. Department of Preventive Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea.