Vincenti, F.; Basile, A.; Contro, E.; Galbiati, F.; Oppizzi, A.; Restelli, E.; Sommariva, M.; Coen, D. Outcome at Three Months of COPD Patients With Acute Hypercapnic Respiratory Failure Treated With NPPV in an Acute Medicine Ward. Emerg Care J 2011, 7, 5-9.