[1] Washington Univ, Sch Med, Dept Neurosurg, St Louis, MO 63130 USA
[2] Univ Pikeville, Kentucky Coll Osteopath Med, Pikeville, KY USA
[3] Univ Colorado, Dept Neurosurg, Sch Med, Aurora, CO USA
[4] Northwestern Univ, Feinberg Sch Med, Chicago, IL USA
[5] Weill Cornell Med, Dept Neurol Surg, New York, NY USA
[6] Univ Arizona, Dept Orthoped Surg, Tucson, AZ USA
[7] Rutgers State Univ, New Jersey Med Sch, Dept Neurosurg, Newark, NJ USA
[8] Rutgers State Univ, Robert Wood Johnson Med Sch, Dept Neurosurg, New Brunswick, NJ USA
[9] Tufts Med Ctr, Dept Neurosurg, Boston, MA USA
[10] Univ Calif San Francisco, Dept Neurosurg, San Francisco, CA USA
[11] Connecticut Childrens, Div Neurosurg, Hartford, CT USA
[12] Brain & Spine Grp Inc, Med Student Neurosurg Training Ctr, Pasadena, CA USA