1. From the Department of Neurosurgery, University of Louisville, KY (D.D.)
2. Department of Neurological Surgery, University of Miami, FL (R.M.S.)
3. Department of Neurological Surgery, University of Pittsburgh, PA (H.K., L.D.L.)
4. Department of Neurosurgery, University of Pennsylvania, Philadelphia (J.Y.K.L.)
5. Division of Neurosurgery, Centre de recherché du CHUS, University of Sherbrooke, QC, Canada (D.M.)
6. Section of Neurological Surgery, University of Puerto Rico, San Juan (C.F., R.R.-M., L.A.)
7. Beaumont Health System, Royal Oak, MI (I.S.G.)
8. Department of Neurosurgery, New York University Langone Medical Center (D.K.)
9. Department of Neurosurgery, Cleveland Clinic Foundation, OH (G.H.B.).