title: Direct-reading normograms for systolic time intervals (S.T.I.).
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction; D013599:Systole