Facsimile and the practice of electrocardiography.
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003308:Copying Processes; D004562:Electrocardiography / Q000295:instrumentation*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013689:Telephone