Relationship between microvascular changes, autonomic denervation, and myocardial fibrosis in Chagas cardiomyopathy: evaluation by MRI and SPECT imaging - Barizon, Gustavo Canavaci; Simões, Marcus Vinícius; Schmidt, Andre; Gadioli, Leonardo Pippa; Murta Júnior, Luiz Otávio (Journal of Nuclear Cardiology, 2020)