[1] Emerson Hosp, Dept Surg, Concord, MA USA
[2] Emerson Hosp, Neurosurg Serv, Concord, MA USA
[3] Emerson Hosp, Sports Med Serv, Concord, MA USA
[4] Natl Ctr Catastroph Sports Injury Res, Chapel Hill, NC USA
[5] Schulthess Clin, Dept Neurol, Zurich, Switzerland
[6] FIFA Med Res & Assessment Ctr, Zurich, Switzerland
[7] German Soc Musculoskeletal Med & Pain Therapy, FIFA Med Res & Assessment Ctr, Off Sci Management, Teningen, Germany
[8] McGill Univ, Dept Neurosurg, Montreal, PQ H3A 2T5, Canada
[9] McGill Univ, Dept Kinesiol & Phys Educ, Montreal, PQ H3A 2T5, Canada
[10] McGill Sport Med Ctr, Concuss Program, Montreal, PQ, Canada
[11] Univ Colorado, Sch Med, Denver, CO USA
[12] Univ Pittsburgh, Sports Med Concuss Program, Pittsburgh, PA USA
[13] Natl Hockey League Neuropsychol Program, Pittsburgh, PA USA
[14] Univ Melbourne, Ctr Hlth Exercise & Sports Med, Melbourne, Vic, Australia
[15] Univ Melbourne, Brain Res Inst, Melbourne, Vic, Australia
[16] Univ Calgary, Sport Med Ctr, Calgary, AB, Canada
[17] Natl Hockey League, Calgary, AB, Canada
[18] Int Olymp Comm, Lausanne, Switzerland