1. Section of Musculoskeletal Imaging, Department of Radiology and Imaging Sciences, Emory University Hospital, 59 Executive Park South, 4th Fl, Ste 4009, Atlanta, GA 30329.
2. Department of Orthopedic Surgery, Emory University Hospital, Atlanta, GA.
3. Department of Neurology, Emory University Hospital, Atlanta, GA.
4. Department of Neurologic Surgery, Emory University Hospital, Atlanta, GA.
5. Department of Radiology and Orthopedic Surgery, University of Texas Southwestern, Dallas, TX.