title: Ultradian diurnal variations of QTc and relevant cardiovascular characteristics should be considered with regard to risk assessment.
authors.forename: H J
authors.initials: HJ
authors.lastname: Koch
authors.forename: C
authors.initials: C
authors.lastname: Raschka
mesh_terms: D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D002940:Circadian Rhythm; D004562:Electrocardiography; D006801:Humans; D013997:Time Factors