PT  - JOURNAL ARTICLE
AU  - H. Kent
TI  - How many concussions are too many?
DP  - 1999 Mar 23
TA  - Canadian Medical Association Journal
PG  - 884--884
VI  - 160
IP  - 6
4099  - http://www.cmaj.ca/content/160/6/884.short
4100  - http://www.cmaj.ca/content/160/6/884.full
SO  - CMAJ1999 Mar 23; 160