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Wirtz, VJ; Hogerzeil, HV; Gray, AL; Bigdeli, M; de Joncheere, CP; et al. Essential medicines for universal health coverage. The Lancet. 2017-01-28, 389 (10067): 403–476. PMID 27832874. doi:10.1016/S0140-6736(16)31599-9.