title: Epidemiological and sociocultural factors in the etiology of duodenal ulcer.
mesh_terms: D000367:Age Factors; D003469:Culture; D003937:Diagnosis, Differential; D004381:Duodenal Ulcer / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology* / Q000235:genetics; D004641:Emigration and Immigration; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008297:Male; D011602:Psychophysiologic Disorders; D012106:Research; D012737:Sex Factors; D012924:Social Conditions; D012959:Socioeconomic Factors; D013276:Stomach Ulcer / Q000175:diagnosis; D013315:Stress, Psychological