Marwa Samee, Irfan Ullah, Muhammad Moeez Badar, Nimra Manzoor, and Maryum Maheen Nazeer. “The Relationship Between Constipation, Nutritional Status, and Disease-Related Parameters in COPD Patients: A Comprehensive Comparative Analysis”. Pakistan Journal of Chest Medicine, vol. 28, no. 3, Sept. 2022, pp. 308-15, doi:10.1996/pjcm.v28i3.808.