Samia Ayub, Kashmala Hussain, Umm-e-Abiha, Hania Fatima, Amal Mahmood, Javaid Ahmed Khan, “Prevalence of Tobacco and Betel Nut Use among Cancer Patients in Two Major Hospitals in Karachi ”, IJPRT, vol. 16, no. 1, pp. 1495–1501, Apr. 2026.