title: [Interventional studies of inhalation technique in patients with chronic obstructive pulmonary disease have methodological drawbacks, but are nonetheless necessary].
authors.forename: E
authors.initials: E
authors.lastname: Calvo Corbella
mesh_terms: D000280:Administration, Inhalation; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000188:drug therapy*