1. School of Medicine, Case Western Reserve University, Cleveland, Ohio, United States
2. Baylor College of Medicine, Houston, Texas, United States
3. Department of Neurosurgery, Neurological Institute, Cleveland Clinic, Cleveland, Ohio, United States
4. Center for Spine Health, Cleveland Clinic, Cleveland, Ohio, United States
5. Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio, United States