1. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea.
2. Department of General Surgery, Kosin University College of Medicine, Busan, Korea.
3. Department of Pathology, Kosin University College of Medicine, Busan, Korea.
4. I Saem Thyroid Clinic, Busan, Korea.
5. Department of Surgery, Noguchi Thyroid Clinic, Beppu, Oita, Japan.