Prevalence of Pan, Gutka, Betalnut, Naswar and Cigarette Smoking in University Students of Karachi. Medical Forum Monthly, [S. l.], v. 26, n. 1, 2024. Disponível em: https://medicalforummonthly.com/index.php/mfm/article/view/2709.. Acesso em: 1 feb. 2026.