title: Flutter-type mucus-clearance devices and pulmonary function in the elderly.
authors.forename: Helen M
authors.initials: HM
authors.lastname: Sorenson
mesh_terms: D000369:Aged, 80 and over; D000375:Aging; D002681:China; D005260:Female; D006801:Humans; D008297:Male; D012016:Reference Values; D012138:Respiratory Therapy / Q000295:instrumentation*; D013147:Spirometry; D014797:Vital Capacity / Q000502:physiology*