RT Journal Article SR Electronic T1 Obama taps new allies and tackles age-old divisions in nudging health care reform JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E111 OP E113 DO 10.1503/cmaj.109-3132 VO 182 IS 2 A1 Cal Woodward YR 2010 UL http://www.cmaj.ca/content/182/2/E111.abstract