[Effect of smoking on the heart in young men, with special reference to axis of the heart].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D003327:Coronary Disease / Q000209:etiology; D004562:Electrocardiography; D006321:Heart / Q000033:anatomy & histology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012907:Smoking; D013997:Time Factors