RT Journal Article SR Electronic T1 Muddling thru models JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1283 OP E1284 DO 10.1503/cmaj.109-4042 VO 183 IS 18 A1 Paul Christopher Webster YR 2011 UL http://www.cmaj.ca/content/183/18/E1283.abstract