title: Noninvasive ventilation for COPD: volume assurance not very reassuring.
authors.forename: Nicholas S
authors.initials: NS
authors.lastname: Hill
mesh_terms: D001785:Blood Gas Monitoring, Transcutaneous; D017079:Exercise Tolerance; D006801:Humans; D006935:Hypercapnia / Q000628:therapy; D011175:Positive-Pressure Respiration / Q000379:methods*; D029424:Pulmonary Disease, Chronic Obstructive / Q000628:therapy*; D016032:Randomized Controlled Trials as Topic; D012107:Research Design; D012129:Respiratory Function Tests