1. Specific Organs Cancer Branch; Department of Otolaryngology; Center for Thyroid Cancer; Research Institute and Hospital; National Cancer Center; Gyeonggi Korea
2. Department of Clinical Epidemiology and Biostatistics; Asan Medical Center; College of Medicine; University of Ulsan; Seoul Korea
3. Department of Preventive Medicine; Asan Medical Center; College of Medicine; University of Ulsan; Seoul Korea
4. Department of Otolaryngology; Asan Medical Center; College of Medicine; University of Ulsan; Seoul Korea