1. Division of Head and Neck Endocrine Surgery, Department of Otolaryngology – Head and Neck Surgery Johns Hopkins University School of Medicine Baltimore Maryland USA
2. A.R.M. Otolaryngology – Head and Neck, Maxillofacial Clinics Assuta Medical Center Tel Aviv Israel
3. Endocrine Surgery Program, Michael E. DeBakey Department of Surgery Baylor College of Medicine Houston Texas USA