RT Journal Article SR Electronic T1 Feasibility of screening for anal cancer in HIV-positive people older than 50 years in Canada JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E171 OP E171 DO 10.1503/cmaj.71187 VO 191 IS 6 A1 Edward S. Weiss YR 2019 UL http://www.cmaj.ca/content/191/6/E171.abstract