[1] Univ British Columbia, Dept Med, Div Phys Med & Rehabil, Vancouver, BC, Canada
[2] Harvard Med Sch, Dept Phys Med & Rehabil, Boston, MA USA
[3] Red Sox Fdn, Boston, MA USA
[4] Massachusetts Gen Hosp, Home Base Program, Boston, MA 02114 USA
[5] Spaulding Rehabil Hosp, Boston, MA USA
[6] MassGen Hosp, Children Sports Concuss Program, Boston, MA USA
[7] Med Coll Wisconsin, Dept Neurosurg, Clement J Zablocki VA Med Ctr, Milwaukee, WI 53226 USA
[8] Med Coll Wisconsin, Dept Psychiat & Behav Med, Milwaukee, WI 53226 USA
[9] Med Coll Wisconsin, Dept Pediat, 8701 Watertown Plank Rd, Milwaukee, WI 53226 USA