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Bertoldi, Andrea, Barros, Aluisuo J.D, Camargo, Aline L., Hallal, Pedro C., Vandoros, Sotiris, Wagner, Anita and Ross-Degnan, Dennis (2011) Household expenditures for medicines and the role of free medicines in the Brazilian public health system. American Journal of Public Health, 101 (5). pp. 916-921. ISSN 0090-0036