Barus, Putri, and Fani Irma. “Comparison of Total Leukocytes in Conventional Smokers and E-Smokers in Students of the Faculty of Medicine, University of Muhammadiyah North Sumatra”. Health & Medical Sciences 3, no. 1 (November 22, 2025): 10. Accessed June 4, 2026. https://digital-science.pubmedia.id/index.php/phms/article/view/527.