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Nunes GL, Nicolela Júnior EL, Sousa GM, Maldonado G, Cano MM, Esteves CA, Braga SL, Yaktine HM, Feres F, et al.Nunes GL, et al. Among authors: feres f.Arq Bras Cardiol. 1991 Feb;56(2):109-13.Arq Bras Cardiol. 1991.PMID: 1872722Portuguese.