Ahmed Memon, A. ., Ayaz Mustufa, M. ., & Ashfaq, M. . (2010). Frequency of Smoking Among Employees at a Tertiary Care Children Hospital, Karachi. Journal of the Dow University of Health Sciences (JDUHS), 4(1), 43–46. Retrieved from https://jduhs.jduhs.duhs.edu.pk/index.php/jduhs/article/view/1293