1. Department of Otolaryngology–Head and Neck SurgeryUniversity of Iowa Hospitals and Clinics Iowa City Iowa
2. Department of Otolaryngology–Head and Neck SurgeryHarvard Medical School Boston Massachusetts
3. Division of Thyroid and Parathyroid Endocrine SurgeryMassachusetts Eye and Ear Infirmary, Surgical Oncology, Massachusetts General Hospital Boston Massachusetts
4. Department of SurgeryTulane University School of Medicine New Orleans Louisiana U.S.A.