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Halperin, Daniel T., Mugurungi, Owen, Hallett, Timothy B., Muchini, Backson, Campbel, Bruce, Magure, Tapuwa, Benedikt, Clemens and Gregson, Simon (2011) A surprising prevention success: why did the HIV epidemic decline in Zimbabwe? PLoS Medicine, 8 (2). e1000414. ISSN 1549-1277