[1] Univ Melbourne, Florey Inst Neurosci & Mental Hlth, Heidelberg, Vic, Australia
[2] Univ Calgary, Fac Kinesiol, Sport Injury Prevent Res Ctr, Calgary, AB, Canada
[3] Univ Zurich, Dept Neurol, Zurich, Switzerland
[4] Univ Zurich, Swiss Concuss Ctr, Zurich, Switzerland
[5] Univ Orthopaed Ctr, Concuss Care Clin, State Coll, PA USA
[6] Univ Missouri, Dept Psychol, Kansas City, MO 64110 USA
[7] Psychol & Neurobehav Assoc Inc, Miami, FL USA
[8] Oslo Univ Hosp, Dept Orthopaed Surg, Oslo, Norway
[9] Oslo Univ Hosp, Fac Med, Oslo, Norway
[10] Oslo Sports Trauma Res Ctr, Oslo, Norway
[11] IOC, Lausanne, Switzerland
[12] Univ Hosp Zurich, Dept Neurol, Zurich, Switzerland
[13] Swiss Concuss Ctr, Schulthess Clin, Zurich, Switzerland
[14] Med Coll Wisconsin, Dept Neurosurg, Milwaukee, WI 53226 USA
[15] Clement Zablocki VA Med Ctr, Milwaukee, WI USA
[16] Melbourne Brain Ctr, Inst Neurosci & Mental Hlth, Austin Campus, Heidelberg, Vic, Australia
[17] La Trobe Univ, La Trobe Sport & Exercise Med Res Ctr, Bundoora, Vic, Australia
[18] Olymp Pk Sports Med Ctr, Melbourne, Vic, Australia
[19] Univ Pretoria, Fac Hlth Sci, Sect Sports Med, Johannesburg, South Africa
[20] Univ Witwatersrand, Fac Hlth Sci, Dept Emergency Med, Johannesburg, South Africa
[21] Sport Injury Prevent Res Ctr, Fac Kinesiol, Calgary, AB, Canada
[22] Univ Calgary, Cumming Sch Med, Alberta Childrens Hosp Res Inst, Calgary, AB, Canada
[23] Univ Calgary, Cumming Sch Med, Hotchkiss Brain Inst, Calgary, AB, Canada
[24] Orthopaed Surg & Rehabil, Dept Neurosurg, Franklin, TN USA
[25] Vanderbilt Univ, Med Ctr, Vanderbilt Sports Concuss Ctr, Franklin, TN USA