Effect of Cigarette Smoking on Trace Elements among Residents in Khartoum State, Sudan. Global Journal of Medical Research, [S. l.], v. 20, n. F4, p. 13–18, 2020. Disponível em: https://medicalresearchjournal.org/index.php/GJMR/article/view/2028. Acesso em: 10 aug. 2026.