METHODS : We included data from people participating in the Vancouver Injection Drug Users Study who reported injecting illicit drugs at least once in the month before enrolment , lived in the greater Vancouver area , were HIV-negative at enrolment and completed at least 1 follow-up study visit .
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-DiseaseOrPhenotypicFeature O O O O O O O O O O O