PT - JOURNAL ARTICLE ED - , TI - Correlates of certification in family medicine in the billing patterns of Ontario general practitioners DP - 1990 Jan 15 TA - Canadian Medical Association Journal PG - 98--99 VI - 142 IP - 2 4099 - http://www.cmaj.ca/content/142/2/98.short 4100 - http://www.cmaj.ca/content/142/2/98.full SO - CMAJ1990 Jan 15; 142