title: Temporal and heart-size effects in first-heart-sound spectra.
mesh_terms: D000818:Animals; D004285:Dogs; D006321:Heart / Q000033:anatomy & histology*; D006326:Heart Auscultation; D006347:Heart Sounds; D006801:Humans; D008943:Mitral Valve / Q000502:physiology; D010701:Phonocardiography; D013997:Time Factors; D014732:Vibration