On the validity of mailed questionnaires in diagnosing "angina pectoris" and "bronchitis".
D000787:Angina Pectoris / Q000453:epidemiology / Q000401:mortality; D001991:Bronchitis / Q000453:epidemiology* / Q000401:mortality; D004200:Diseases in Twins / Q000453:epidemiology*; D005080:Exercise Test; D005260:Female; D006801:Humans; D008297:Male; D010808:Physical Examination; D012129:Respiratory Function Tests; D012189:Retrospective Studies; D013548:Sweden