title: STUDIES IN ECOLOGY OF CORONARY HEART DISEASE. I. VARIATIONS IN THE HUMAN ELECTROCARDIOGRAM UNDER CONDITIONS OF DAILY LIFE (A PRELIMINARY REPORT).
mesh_terms: D001145:Arrhythmias, Cardiac; D003327:Coronary Disease; D004463:Ecology; D004562:Electrocardiography; D006334:Heart Function Tests; D006801:Humans; D010827:Physiology; D014693:Ventricular Fibrillation
keywords: ARRHYTHMIA; CORONARY DISEASE; ECOLOGY; ELECTROCARDIOGRAPHY; HEART FUNCTION TESTS; PHYSIOLOGY; VENTRICULAR FIBRILLATION