Mortensen, J The effects of postural drainage and positive expiratory pressure physiotherapy on tracheobronchial clearance in cystic fibrosis. [electronic resource] - Chest Nov 1991 - 1350-7 p. digital Publication Type: Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't ISSN: 0012-3692 Standard No.: 10.1378/chest.100.5.1350 doi Subjects--Topical Terms: AdolescentAdultAirway Obstruction--etiologyCough--etiologyCystic Fibrosis--complicationsDouble-Blind MethodDrainage, PosturalFemaleForced Expiratory VolumeHumansMaleMucociliary Clearance--physiologyPhysical Therapy ModalitiesPositive-Pressure RespirationRadionuclide ImagingSputum--diagnostic imagingTechnetium