title: Age differences in the spatial vectors and vectorcardiogram utilizing various orthogonal electrocardiographic lead systems.
mesh_terms: D000328:Adult; D000367:Age Factors; D004562:Electrocardiography; D006321:Heart / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D014672:Vectorcardiography / Q000379:methods