Relation between interstitial myocardial collagen and the degree of clinical impairment in Chagas' disease - Mady, Charles; Ianni, Bárbara Maria; Arteaga, Edmundo; Montes, Gregório Santiago; Caldini, Elia Tamaso Espin Garcia; Andrade, Gisele; Giorgi, Maria Clementina P.; Saldiva, Paulo Hilário Nascimento (American Journal of Cardiology, 1999)