1. Department of Internal Medicine, Catholic University of Daegu, Daegu, Republic of Korea.
2. Department of Otorhinolaryngology, Catholic University of Daegu, Daegu, Republic of Korea.
3. Department of Internal Medicine, Raphael Thyroid Clinic, Daegu, Republic of Korea.
4. Department of Pathology, Raphael Thyroid Clinic, Daegu, Republic of Korea.