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| Author | Title | Year | Publication | Volume | Pages |
|---|---|---|---|---|---|
| Somaini, Bertino; Wang, Jen; Perozo, Malile; Kuhn, Fredy; Meili, Daniel; Grob, Peter; Flepp, Markus | A continuing concern : HIV and hepatitis testing and prevalence among drug users in substitution programs in Zurich, Switzerland | 1999 | 22 |