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 (Dec. 2022), 458–464. DOI:https://doi.org/10.1996/pjcm.v28i4.809.