Long‐Term Oxygen Therapy and Cognitive Function in Chronic Obstructive Pulmonary Disease: A Systematic Review. - Fawwad, Shaikh; Makhlouf, Saed S. K.; Mahgoub, Mazen; Makhlouf, Roba Sabri Kamel; Monjur, Sumaiya; Thapar, Nandita; Dal Negro, Roberto Walter (Pulmonary Medicine, 2026)