Kenan Arnautovic, MD, PhD, FAANS, FACS Professor of Neurosurgery, Semmes-Murphey Clinic and Department of Neurosurgery, University of Tennessee Health Science Center College of Medicine, Memphis, TN, USA Brain & Spinal Tumor, Neurosurgical Spine Surgery, Pituitary Surgery, Skull Base Chairman, Baptist Neuroscience Institute, Baptist Memorial Hospital, Memphis, TN, USA