Duodenal ulcer as a second disease.
D000787:Angina Pectoris / Q000150:complications / Q000453:epidemiology; D001172:Arthritis, Rheumatoid / Q000150:complications / Q000453:epidemiology; D001991:Bronchitis / Q000150:complications / Q000453:epidemiology; D048909:Diabetes Complications; D003920:Diabetes Mellitus / Q000453:epidemiology; D004381:Duodenal Ulcer / Q000150:complications*; D006801:Humans; D008404:Massachusetts; D009203:Myocardial Infarction / Q000150:complications / Q000453:epidemiology; D010820:Physicians; D011656:Pulmonary Emphysema / Q000150:complications / Q000453:epidemiology; D012907:Smoking / Q000150:complications; D011795:Surveys and Questionnaires