TY - JOUR T1 - Correlates of certification in family medicine in the billing patterns of Ontario general practitioners JF - Canadian Medical Association Journal JO - CMAJ SP - 98 LP - 99 VL - 142 IS - 2 A2 - , Y1 - 1990/01/15 UR - http://www.cmaj.ca/content/142/2/98.abstract ER -