[1] Boston Childrens Hosp, Div Emergency Med, 300 Longwood Ave, Boston, MA 02115 USA
[2] Univ Ottawa, Dept Pediat, Ottawa, ON, Canada
[3] Univ Ottawa, Dept Emergency Med, Ottawa, ON, Canada
[4] Univ Calgary, Dept Psychol, Calgary, AB, Canada
[5] Univ Calgary, Alberta Childrens Hosp Res Inst, Fac Kinesiol, Sport Injury Prevent Res Ctr, Calgary, AB, Canada
[6] Univ Calgary, Hotchkiss Brain Inst, Calgary, AB, Canada
[7] Univ Penn, Childrens Hosp Philadelphia, Perelman Sch Med,Div Emergency Med, Sports Med & Performance Ctr,Ctr Injury Res & Pre, Philadelphia, PA 19104 USA
[8] Univ Penn, Childrens Hosp Philadelphia, Perelman Sch Med,Div Orthopaed, Sports Med & Performance Ctr,Ctr Injury Res & Pre, Philadelphia, PA 19104 USA
[9] Childrens Natl Hlth Syst, Div Emergency Med, Washington, DC USA
[10] Univ Texas Southwestern Med Sch, Dept Pediat, Dallas, TX USA
[11] Univ Montreal, Dept Psychol, Montreal, PQ, Canada
[12] Univ Montreal, Div Emergency Med, Montreal, PQ, Canada
[13] Univ Manitoba, Childrens Hosp Winnipeg, Sect Pediat Emergency Med, Winnipeg, MB, Canada
[14] Univ Manitoba, Childrens Hosp Winnipeg, Dept Pediat & Child Hlth, Winnipeg, MB, Canada
[15] UCSF Sch Med, Div Pediat Emergency Med, San Francisco, CA USA
[16] McGill Univ, Ctr Hlth, Montreal Childrens Hosp, Div Pediat Emergency Med,Dept Pediat, Montreal, PQ, Canada
[17] Univ Alberta, Dept Pediat, Edmonton, AB, Canada
[18] Stollery Childrens Hosp, Edmonton, AB, Canada
[19] Univ British Columbia, Dept Pediat, Div Emergency Med, Childrens Res Inst, Vancouver, BC, Canada
[20] Univ Manitoba, Sect Neurosurg, Dept Surg & Pediat, Pan Am Concuss Program, Winnipeg, MB, Canada
[21] Univ Calgary, Cumming Sch Med, Alberta Childrens Hosp Res Inst,Dept Pediat, Alberta Childrens Hosp,Stephen B Freedman Sect Pe, Calgary, AB, Canada
[22] Univ Calgary, Cumming Sch Med, Alberta Childrens Hosp Res Inst,Dept Pediat, Alberta Childrens Hosp,Stephen B Freedman Sect Ga, Calgary, AB, Canada
[23] McGill Univ, Ctr Hlth, Montreal Childrens Hosp, Sch Phys & Occupat Therapy,Trauma Programs, Montreal, PQ, Canada
[24] SUNY Buffalo, UBMD Dept Orthopaed & Sports Med, Buffalo, NY USA
[25] SUNY Buffalo, Pediat Div Emergency Med, Buffalo, NY USA
[26] SUNY Buffalo, Jacobs Sch Med & Biomed Sci, Buffalo, NY USA
[27] Stanford Univ, Dept Emergency Med, Concuss & Brain Performance Ctr, Stanford, CA 94305 USA
[28] Stanford Univ, Dept Pediat, Concuss & Brain Performance Ctr, Stanford, CA 94305 USA
[29] Univ New Mexico, Mind Res Network LBERI, Albuquerque, NM 87131 USA
[30] Univ New Mexico, Dept Psychol, Albuquerque, NM 87131 USA
[31] Univ New Mexico, Dept Neurol & Psychiat, Albuquerque, NM 87131 USA
[32] Univ New Mexico Hosp, Dept Emergency Med, Albuquerque, NM USA
[33] Univ Cincinnati, Coll Med, Dept Pediat, Cincinnati Childrens Hosp Med Ctr,Div Emergency M, Cincinnati, OH USA
[34] Childrens Natl Med Ctr, Dept Pediat & Crit Care Med, Washington, DC 20010 USA
[35] Univ Pittsburgh, Grad Sch Publ Hlth, Pittsburgh, PA USA