RT Journal Article SR Electronic T1 Needle exchange programs and drug use JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 171 OP 171 VO 158 IS 2 A1 Gold, M. A1 Gafni, A. A1 Nelligan, P. A1 Millson, P. YR 1998 UL http://www.cmaj.ca/content/158/2/171.1.abstract AB