Edward C. Benzel, MD Chairman, Department of Neurosurgery, Director, Center for Spine Health, Neurological Institute, Cleveland Clinic, Cleveland, Ohio, USA, Zoher Ghogawala, MD, FACS Attending Physician, Neurosurgery, Greenwich Hospital, Clinical Assistant Professor of Neurosurgery, Yale University Director, Wallace Clinical Trials Center, Greenwich Hospital Greenwich Neurosurgery, Greenwich, Connecticut, USA, Ajit A. Krishnaney, MD Associate Staff, Department of Neurosurgery, Associate Staff, Center for Spine Health, Associate Staff, Cerebrovascular Center, Cleveland Clinic, Cleveland, Ohio, USA, Michael P. Steinmetz, MD Associate Staff, Department of Neurosurgery, Associate Staff, Center for Spine Health, Associate Staff, Cerebrovascular Center, Associate Staff, Department of Neurosciences, Cleveland Clinic, Cleveland, Ohio, USA, H. Hunt Batjer, MD, FACS Professor & Chair, Neurological Surgery, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA