1. Department of Radiology, Medical College of Wisconsin, Milwaukee, Wisconsin.
2. Department of Pathology, Pediatric Division, and Medical College of Wisconsin, Milwaukee, Wisconsin.
3. Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin.
4. The Mind Research Network/Lovelace Biomedical and Environmental Research Institute, Neurology and Psychiatry Departments, University of New Mexico School of Medicine, Department of Psychology, University of New Mexico, Albuquerque, New Mexico.
5. Department of Epidemiology and Biostatistics, Indiana University, Bloomington, Indiana.
6. Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, Indiana.
7. Department of Family Medicine and Orthopedics, University of California Los Angeles, Los Angeles, California.
8. Department of Pediatrics and Neurosurgery, and University of California Los Angeles, Los Angeles, California.
9. Department of Family Medicine, University of California Los Angeles, Los Angeles, California.
10. Department of Exercise and Sport Science, University of North Carolina, Chapel Hill, North Carolina.
11. Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, Virginia.
12. Department of Orthopedics and Rehabilitation, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin.
13. School of Kinesiology, University of Michigan, Ann Arbor, Michigan.
14. Department of Psychiatry, Indiana University School of Medicine, Bloomington, Indiana.