1. Division of Endocrinology & Metabolism, Department of Medicine, Thyroid Centre, Samsung Medical Centre, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Department of Laboratory Medicine and Genetics, Samsung Medical Centre, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Pathology, Samsung Medical Centre, Sungkyunkwan University School of Medicine, Seoul, Korea.