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Saira Ali, Zainab Hassan, Anum Khalid, Bilal Ahmad, Mahat Zahra, Mishal Gul 2023. Effects of Controlled Breathing Maneuver on Exercise Tolerance in Patients with Chronic Obstructive Pulmonary Disease. Pakistan Journal of Medical & Health Sciences. 17, 02 (Mar. 2023), 166. DOI:https://doi.org/10.53350/pjmhs2023172166.