Moolman, J.A., L. Du Preez, and G. Rossouw. “Serum Brain Natriuretic Peptide (BNP) and N-Terminal Brain Natriuretic Peptide (NT-ProBNP) in Heart Valve Disease”. SA Heart Journal 5, no. 1 (April 21, 2017): 12–19. Accessed October 8, 2025. https://www.journals.ac.za/SAHJ/article/view/2057.