Alexander R Vaccaro MD PhD MBARichard H Rothman Professor and Chairman, Department of Orthopaedic Surgery, Professor of Neurosurgery, Thomas Jefferson University, President, The Rothman Institute, Philadelphia, Pennsylvania, USAJohn D Koerner MD Department of Orthopaedic Surgery, The Rothman Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, USADaniel H Kim MD FAANS FACSDirector, Reconstructive Spinal and Peripheral Nerve Surgery, Memorial Hermann Mischer Neuroscience Institute, Professor, Nancy, Cliver and Pierce Runnells Distinguished, Chair in Neuroscience, Vivian L Smith Department of Neurosurgery, UTHealth Medical School, Houston, Texas, USA