1. Department of Anesthesiology, Kaohsiung Municipal Siaogang Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
2. Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
3. Department of Otorhinolaryngology- Head and Neck Surgery, Kaohsiung Municipal Siaogang Hospital, and Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
4. Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A
5. Division of Surgical Oncology, Endocrine Surgery Service, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, U.S.A
6. Division for Endocrine Surgery, Department of Human Pathology in Adulthood and Child-hood ''G. Barresi'', University Hospital G. Martino, University of Messina, Messina, Sicily, Italy
7. Department of Otolaryngology, E-Da Hospital, I-Shou University, Kaohsiung, Taiwan