PT - JOURNAL ARTICLE AU - Johnson, L. Syd M. TI - Concussion in youth ice hockey: It’s time to break the cycle AID - 10.1503/cmaj.110282 DP - 2011 May 17 TA - Canadian Medical Association Journal PG - 921--924 VI - 183 IP - 8 4099 - http://www.cmaj.ca/content/183/8/921.short 4100 - http://www.cmaj.ca/content/183/8/921.full SO - CMAJ2011 May 17; 183