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A Cross-Sectional Study in Patients with Severe COPD to Assess the Perception of Symptom Variability (COPVAR) in the Middle East and Africa. by Kokturk N, Abuharbid W, Albanna AS, Gunen H, Gurgun A, Khadadah M, Malvolti E, Soliman M, van Zyl-Smit R, Zid…