Raffay Ali Gilani, S., Hussain, G., Ahmad, N., Ahmad Raza Baig, M. and Zaman, H. 2016. COMPARISON OF POST-OPERATIVE ATELECTASIS IN PATIENTS UNDERGOING CORONARY ARTERY BYPASS GRAFTING WITH AND WITHOUT PRE-OPERATIVE INCENTIVE SPIROMETRY. Journal of Postgraduate Medical Institute. 30, 2 (Apr. 2016).