RT Journal Article SR Electronic T1 Needle exchange programs JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1201 OP 1201 VO 157 IS 9 A1 Gold, M. A1 Gafni, A. A1 Nelligan, P. A1 Millson, P. YR 1997 UL http://www.cmaj.ca/content/157/9/1201.1.abstract AB