RT Journal Article SR Electronic T1 Nearly a third of tests and treatments are unnecessary: CIHI JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E620 OP E621 DO 10.1503/cmaj.1095417 VO 189 IS 16 A1 Lauren Vogel YR 2017 UL http://www.cmaj.ca/content/189/16/E620.abstract