title: Investigation of an apparatus for calibrated phonocardiography according to the Mannheimer-Stordal system.
authors.forename: H
authors.initials: H
authors.lastname: LJUNGGREN
mesh_terms: D002138:Calibration; D004864:Equipment and Supplies; D006321:Heart; D006337:Heart Murmurs; D006801:Humans; D010701:Phonocardiography; D013016:Sound
keywords: APPARATUS; HEART/murmurs and sounds