To Study Electrocardiogram (ECG) Changes in Patients of Heart Failure with Mildly Reduced Ejection Fraction (LVEF 41%-49%) (Code-T0098). [s.l.] : Medical Thesis,2025. Disponível em: https://medicalthesis.org/index.php/mt/catalog/book/99. Acesso em: 20 apr. 2025.