1. Thyroid Gland Center, Korea University, Anam Hospital, Seoul, Korea.
2. Division of Thyroid Surgery, Jilin Provincial Key Laboratory of Surgical Translational Medicine, China-Japan Union Hospital of Jilin University, Changchun, China.
3. Department of Surgery, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
4. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea.
5. Division of General Surgery, Department of Medicine and Surgery, Research Center for Endocrine Surgery, University of Insubria, Varese, Italy.