1. Department of Otolaryngology-Head and Neck Surgery, Wexner Medical Center at The Ohio State University; Columbus Ohio U.S.A
2. Department of Skull Base Surgery; Institute of Neurosurgery Doctor Asenjo (INCA); Santiago Chile
3. Department of Otolaryngology; Clínica Alemana; Santiago Chile
4. Department of Neurosurgery; Wexner Medical Center at The Ohio State University; Columbus Ohio U.S.A