Irfan Ullah, Marwa Samee, Muhammad Moeez Badar, Nimra Manzoor and Moazama Afzal (2022) “The impact of Chronic Obstructive Pulmonary Disease on Outcome of Patients with Colorectal Cancer ”, Pakistan Journal of Chest Medicine, 28(4), pp. 458–464. doi: 10.1996/pjcm.v28i4.809.