Respiratory symptoms and "angina pectoris" in twins with reference to smoking habits. An epidemiological study with mailed questionnaire.
D000328:Adult; D000368:Aged; D000787:Angina Pectoris / Q000453:epidemiology*; D001991:Bronchitis / Q000453:epidemiology*; D003371:Cough / Q000453:epidemiology*; D004200:Diseases in Twins / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009017:Morbidity; D012189:Retrospective Studies; D012907:Smoking; D013548:Sweden