Modelling the impact and cost‐effectiveness of non‐governmental organizations on HIV and HCV transmission among people who inject drugs in Ukraine. - Stone, Jack; Trickey, Adam; Walker, Josephine G.; Bivegete, Sandra; Semchuk, Nadiya; Sazonova, Yana; Varetska, Olga; Altice, Frederick L.; Saliuk, Tetiana; Vickerman, Peter (Journal of the International AIDS Society, 2023)