Heart rate variability as a biomarker in patients with chronic Chagas cardiomyopathy with or without concomitant digestive involvement and its relationship with the Rassi score - Silva, Luiz Eduardo Virgilio da; Moreira, Henrique Turin; Oliveira, Marina Madureira de; Cintra, Lorena Sayore Suzumura; Salgado, Hélio César; Fazan Júnior, Rubens; Tinós, Renato; Rassi Júnior, Anis; Schmidt, Andre; Marin Neto, José Antonio (BioMedical Engineering OnLine, 2022)