1. Medical Student Neurosurgery Training Center, Brain and Spine Group, Inc, Pasadena, California, USA
2. Department of Neurological Surgery, Rutgers Robert Wood Johnson Medical School, New Brunswick, New Jersey, USA
3. Department of Neurological Surgery, Weill Cornell Medical College, New York, New York, USA
4. College of Osteopathic Medicine, Kansas City University, Kansas City, Missouri, USA
5. Department of Neurosurgery, University of Colorado School of Medicine, Aurora, Colorado, USA
6. Division of Neurosurgery, Connecticut Children's, Hartford, Connecticut, USA
7. Department of Surgery, UConn School of Medicine, Farmington, Connecticut, USA