The Stability of Retrospective Pre-injury Symptom Ratings Following Pediatric Concussion by Elizabeth F. Teel, Roger L. Zemek, Roger L. Zemek, Kenneth Tang, Gerard Gioia, Christopher Vaughan, Maegan Sady, Isabelle J. Gagnon, Isabelle J. Gagnon, the Pediatric Emergency Research Canada (PERC) Concussion Team, Martin H. Osmond, Nick Barrowman, Stephen B. Freedman, Jocelyn Gravel, Gurinder Sangha, Kathy Boutis, Darcy Beer, William Craig, Emma Burns, Ken J. Farion

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