Reivana, Shazni Nadia, et al. “Clinical and Epidemiological Profile of Cardiovascular Disease at Rantauprapat Hospital, North Sumatra: A Retrospective Study”. Nusantara Medical Science Journal, vol. 11, no. 1, Apr. 2026, pp. 23-30, https://journal.unhas.ac.id/index.php/jmednus/article/view/49990.