1. Division of Thyroid and Parathyroid Surgery, Department of Otolaryngology, Massachusetts Eye and Ear InfirmaryHarvard Medical School Boston Massachusetts U.S.A.
2. Licking Memorial Hospital Newark U.S.A.
3. Department of Otolaryngology–Head and Neck SurgeryThe Ohio State University College of Medicine Columbus Ohio U.S.A.
4. Division of Surgical Oncology, Department of Surgery, Massachusetts General HospitalHarvard Medical School Boston Massachusetts U.S.A.