1. From the Departments of Neurology (J.I.F., C.K.), Health Studies (L.P.S., K.W., R.A.T.), Statistics (R.A.T.), Anesthesia and Critical Care (R.A.T.), The University of Chicago, IL; Department of Neurosurgery, Mayo Clinic College of Medicine, Rochester, MN (D.C.); and Department of Neurology, Weill Cornell Medical College, New York (A.J.R.).
2. Albany Medical College
3. The Cleveland Clinic Foundation
4. Columbia-Presbyterian Hospital
5. Detroit Receiving Hospital
6. Duke University Medical Center
7. Indiana University Medical Center
8. OSF Saint Francis Medical Center
9. St. Louis University Health Sciences Center
10. Thomas Jefferson University
11. University of Calgary
12. University of California Davis
13. University of Chicago
14. University of Cincinnati
15. University Hospitals of Cleveland
16. University of Kentucky
17. University of Maryland