van der Merwe, J.L., D.R. Hall, P. Herbst, and A. Doubell. “Patient Profi Le of a Tertiary Obstetric-Cardiac Clinic”. SA Heart Journal 11, no. 2 (March 28, 2017): 80–85. Accessed October 8, 2025. https://www.journals.ac.za/SAHJ/article/view/1760.