The indication and utility of the ambidirectional design in the study of chronic Chagas' disease.
D002598:Chagas Cardiomyopathy / Q000453:epidemiology; D014355:Chagas Disease / Q000453:epidemiology*; D002908:Chronic Disease; D003430:Cross-Sectional Studies; D004812:Epidemiologic Methods; D005500:Follow-Up Studies; D011446:Prospective Studies