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McCulloch, Peter and Shaw, April and Gilchrist, Gail and Matheson, Catriona and Maxwell, Margaret and Neale, Joanne and Myring, Gareth and McLeod, Hugh and Hickman, Matt and Vickerman, Peter and Munro, Alison and MacGillivray, Steve (2025) Optimal provision of opiate substitution therapy and needle and syringe programmes: a multi-method realist evaluation. Health Technology Assessment , 29 , (64) , pp. 1-118.