RT Journal Article SR Electronic T1 Too much of a good thing? JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP cmaj.109-4033 DO 10.1503/cmaj.109-4033 A1 Walkinshaw, Erin YR 2011 UL http://www.cmaj.ca/content/early/2011/11/21/cmaj.109-4033.abstract AB