PT  - JOURNAL ARTICLE
AU  - Malcolm Wardlaw
TI  - Butting heads over bicycle helmets
DP  - 2002 Aug 20
TA  - Canadian Medical Association Journal
PG  - 337--338
VI  - 167
IP  - 4
4099  - http://www.cmaj.ca/content/167/4/337.3.short
4100  - http://www.cmaj.ca/content/167/4/337.3.full
SO  - CMAJ2002 Aug 20; 167