RT Journal Article SR Electronic T1 Making early childhood count JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 68 OP 71 DO 10.1503/cmaj.080512 VO 180 IS 1 A1 Clyde Hertzman, MD MSc A1 Robin Williams MD YR 2009 UL http://www.cmaj.ca/content/180/1/68.abstract