1. Cleveland Clinic Lerner College of Medicine, Cleveland Clinic Center for Spine Health, and Department of Neurological Surgery, Cleveland Clinic, Cleveland;
2. Department of Neurosurgery, Johns Hopkins Hospital, Baltimore, Maryland; and
3. Department of Neurosurgery, Stanford University, Palo Alto, California
4. Departments of Surgery,
5. Orthopaedic Surgery, and
6. Neurosciences, MetroHealth Medical Center, Cleveland, Ohio;