RT Journal Article SR Electronic T1 Medically necessary: Who should decide? JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1770 OP 1771 DO 10.1503/cmaj.109-4307 VO 184 IS 16 A1 Collier, Roger YR 2012 UL http://www.cmaj.ca/content/184/16/1770.abstract