Lawrence S. Chin, MD, FACS Robert B. and Molly G. King Endowed Professor and Chair, SUNY Upstate Medical University, Department of Neurosurgery, Syracuse, NY, USA. William F. Regine, MD Isadore and Fannie Schneider Foxman Chair and Professor of Radiation Oncology, Interim Chair, Diagnostic Radiology & Nuclear Medicine, University of Maryland, Department of Radiation Oncology, Baltimore, MD, USA.