title: Analysis of systolic time intervals in normal school children.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D005260:Female; D006321:Heart / Q000502:physiology*; D006801:Humans; D008297:Male; D009200:Myocardial Contraction; D012016:Reference Values; D013599:Systole