title: Origin of the components of the first heart sound studied by biaxial esophageal phonocardiography.
authors.affiliation: Cardiology Department, Leiden University Hospital, The Netherlands.
authors.forename: J G
authors.initials: JG
authors.lastname: Chin
authors.forename: H
authors.initials: H
authors.lastname: Vermariën
authors.forename: E
authors.initials: E
authors.lastname: van Vollenhoven
authors.forename: J
authors.initials: J
authors.lastname: Koops
authors.forename: P J
authors.initials: PJ
authors.lastname: Voogd
authors.forename: A V
authors.initials: AV
authors.lastname: Bruschke
mesh_terms: D004452:Echocardiography; D004947:Esophagus; D006326:Heart Auscultation; D006347:Heart Sounds; D006351:Heart Valves / Q000502:physiology; D006801:Humans; D010701:Phonocardiography / Q000295:instrumentation* / Q000379:methods; D012016:Reference Values