Unamba, N. N.; Edeogu, J. U.; Orji, M. I. The Functional Class and Electrocardiographic Abnormalities in Heart Failure Patients in Southern Nigeria: A Retrospective Observational Study. The Nig Health J 2020, 20 (2), 44-53. https://doi.org/10.60787/tnhj.v20i2.475.