Somaya Noor, Syed Soban Ahmed Tirimzi, Muhammad Salman Khan, Kinza Sammar, Umair Farukh, and Aamir Asmatullah. “Chest Physiotherapy Improves Lung Capacites and Lung Function in Hyper Secretive Critically Ill Patients: A Pilot Randomized Physiological Study”. Pakistan Journal of Chest Medicine, vol. 28, no. 4, Dec. 2022, pp. 471-7, doi:10.1996/pjcm.v28i4.831.