RT Journal Article SR Electronic T1 Press that button again, please JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E242 OP E243 DO 10.1503/cmaj.109-4112 VO 184 IS 5 A1 Erin Walkinshaw YR 2012 UL http://www.cmaj.ca/content/184/5/E242.abstract