RT Journal Article SR Electronic T1 Metformin's contraindications should be contraindicated JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 502 OP 504 DO 10.1503/cmaj.045292 VO 173 IS 5 A1 McCormack, James A1 Johns, Kevin A1 Tildesley, Hugh YR 2005 UL http://www.cmaj.ca/content/173/5/502.abstract