Risk stratification in a Brazilian hospital-based cohort of 1220 outpatients with heart failure: role of Chagas' heart disease - Freitas, Humberto Felício Gonçalves de; Chizzola, Paulo Roberto; Paes, Ângela Tavares; Lima, Antonio Carlos Pedroso de; Mansur, Alfredo José (International Journal of Cardiology, 2005)