PT - JOURNAL ARTICLE AU - D. Keith Howington TI - Child's play AID - 10.1503/cmaj.1040028 DP - 2004 Apr 13 TA - Canadian Medical Association Journal PG - 1211--1211-a VI - 170 IP - 8 4099 - http://www.cmaj.ca/content/170/8/1211.2.short 4100 - http://www.cmaj.ca/content/170/8/1211.2.full SO - CMAJ2004 Apr 13; 170