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Relation of Circadian Ventricular Ectopic Activity to Cardiac Mortality**This study was supported by contracts with the National Heart, Lung, and Blood Institute, Department of Health and Human Services, Bethesda, Maryland.

National HeartCardiovascular DiseaseBlood InstituteHuman ServicesMedicineCardiometabolic PhysiologyCardiac PathologyCircadian RhythmCardiologyChronobiologyCircadian BiologyAnesthesiologyCardiac Arrest