Study of ECG changes in anaemia and correlation with respect to severity of anaemia. International Journal of Biomedical Research, [S. l.], v. 10, n. 11, p. e5197, 2019. DOI: 10.7439/ijbr.v10i11.5197. Disponível em: https://ssjournals.co.in/index.php/ijbr/article/view/5197. Acesso em: 7 jan. 2026.