Peptic ulcer in Massachusetts physicians.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D004381:Duodenal Ulcer / Q000453:epidemiology; D004739:England; D005260:Female; D006801:Humans; D008297:Male; D008404:Massachusetts; D008511:Medicine; D008875:Middle Aged; D009664:Norway; D010437:Peptic Ulcer / Q000453:epidemiology* / Q000209:etiology; D010820:Physicians; D010822:Physicians, Women; D012111:Residence Characteristics; D012737:Sex Factors; D012923:Social Class; D013038:Specialization; D013276:Stomach Ulcer / Q000453:epidemiology