title: Sympathovagal balance: a critical appraisal. Reply.
authors.forename: D L
authors.initials: DL
authors.lastname: Eckberg
mesh_terms: D000818:Animals; D006321:Heart / Q000294:innervation* / Q000502:physiology; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D013564:Sympathetic Nervous System / Q000502:physiology*; D014630:Vagus Nerve / Q000502:physiology*