1. Department of Neurology; Hospital for Special Surgery, 535 East 70th Street; New York New York 10021 USA
2. Healthcare Research Institute, Hospital for Special Surgery; New York New York USA
3. Quality Research Center; Hospital for Special Surgery; New York New York USA
4. Carolina Neurological Clinic; Charlotte North Carolina USA
5. Department of Radiology; Hospital for Special Surgery; New York New York USA
6. New York Medical College; Valhalla New York USA
7. SUNY Downstate Medical Center; Brooklyn New York USA
8. Adult Reconstruction, Department of Orthopedic Surgery; Hospital for Special Surgery; New York New York USA