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Fernandes, Ricardo M and Cary, Maria and Duarte, Gonçalo and Jesus, Gonçalo and Alarcão, Joana and Torre, Carla and Costa, Suzete and Costa, João and Carneiro, António Vaz (2017) Effectiveness of needle and syringe programmes in people who inject drugs - An overview of systematic reviews. BMC Public Health, 17, (1), p. 309. doi: 10.1186/s12889-017-4210-2..