Insoo Suh1, Charles Yingling2, Gregory W Randolph3, Quan-Yang Duh1. 1. Endocrine Surgery Section, Department of Surgery, University of California, San Francisco, Medical Center at Mount Zion, San Francisco2Surgical Service, Veterans Affairs Medical Center, San Francisco, California. 2. Golden Gate Neuromonitoring, San Francisco, California. 3. Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Massachusetts General Hospital, Boston.