title: Long-term recording of the electrocardiogram in a normal population.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D004562:Electrocardiography; D005260:Female; D006321:Heart / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic