RT Journal Article SR Electronic T1 Regulation of natural health products challenged JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1217 OP 1217-a DO 10.1503/cmaj.1040481 VO 170 IS 8 A1 Jocalyn Clark YR 2004 UL http://www.cmaj.ca/content/170/8/1217.2.abstract