Toste, J., V. Carmelo, P. dos Reis, S. Castela, A. Ramos, M. Adão, and T. Ferreira. “Implication of Different CK and CKMB Levels for Clinical Outcomes and Prognosis in Patients Presenting With Acute Coronary Syndromes Without ST- Segment Elevation”. Internal Medicine, vol. 14, no. 4, Dec. 2007, pp. 187-91, https://revista.spmi.pt/index.php/rpmi/article/view/1570.