Factors complicating observed associations between peptic ulcer and other diseases.
D001168:Arthritis / Q000150:complications; D003424:Crohn Disease / Q000150:complications; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008297:Male; D009157:Myasthenia Gravis / Q000150:complications; D009203:Myocardial Infarction / Q000150:complications; D010437:Peptic Ulcer / Q000150:complications* / Q000453:epidemiology / Q000628:therapy; D012017:Referral and Consultation