The cyclic dynamism of the incidence and complications of ulcer disease.
D005508:Food Deprivation; D005843:Geography; D006801:Humans; D010437:Peptic Ulcer / Q000150:complications* / Q000453:epidemiology* / Q000209:etiology / Q000628:therapy; D010438:Peptic Ulcer Hemorrhage / Q000150:complications; D010439:Peptic Ulcer Perforation / Q000150:complications; D010507:Periodicity; D044469:Racial Groups; D012621:Seasons; D012737:Sex Factors; D013217:Starvation; D013997:Time Factors; D014857:Warfare