1. Division of Endocrinology and Metabolism; Department of Medicine, Thyroid Center, Samsung Medical Center, Sungkyunkwan University School of Medicine; Seoul Korea
2. Department of Medical Education; Sungkyunkwan University School of Medicine; Seoul Korea
3. Department of Surgery; Division of Breast and Endocrine Surgery; Thyroid Center, Samsung Medical Center, Sungkyunkwan University School of Medicine; Seoul Korea