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Sociedade Portuguesa de Pneumologia Portugal Nunes, S.; Maia, J.; Ferreira, J.P.; Neves, J.; Marques, I. Oxygen therapy: a clinical audit in an Internal Medicine Departmentdoi:10.1016/j.rppnen.2014.11.005 pmid:25926375 fatcat:ww47hod23nf5bguc4u3bck2wjq