RT Journal Article SR Electronic T1 American entrepreneur files free trade challenge on medicare JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1113 OP 1114 DO 10.1503/cmaj.081703 VO 179 IS 11 A1 Roger Collier YR 2008 UL http://www.cmaj.ca/content/179/11/1113.abstract