[EXPERIENCE WITH THE ELECTROCARDIOGRAPHIC EXAMINATION OF SUBJECTS OVER 40 IN POLYCLINICS].
D002318:Cardiovascular Diseases; D004562:Electrocardiography; D006801:Humans; D008875:Middle Aged; D014586:USSR
CARDIOVASCULAR DISEASES; ELECTROCARDIOGRAPHY; MIDDLE AGE; USSR
OPYT 'ELEKTROKARDIOGRAFICHESKOGO ISSLEDOVANIIA LITS STARSHE 40 LET V USLOVIIAKH POLIKLINIKI.