title: Methodology and basic problems of ECG and VCG research. Hemiblocks.
mesh_terms: D000293:Adolescent; D000368:Aged; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000503:physiopathology*; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008722:Methods; D014672:Vectorcardiography