[Quantitative study of the normal P vector and scalar electrocardiogram by Frank lead system].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D004562:Electrocardiography; D006321:Heart / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D014672:Vectorcardiography