title: [Chronobiological changes in patients with perforated gastric and duodenal ulcers].
authors.forename: G M
authors.initials: GM
authors.lastname: Epanchintsev
authors.forename: A I
authors.initials: AI
authors.lastname: Parfenov
mesh_terms: D002909:Chronobiology Phenomena; D002980:Climate; D004381:Duodenal Ulcer / Q000150:complications*; D006801:Humans; D008685:Meteorological Concepts; D010439:Peptic Ulcer Perforation / Q000453:epidemiology* / Q000209:etiology; D012621:Seasons; D012800:Siberia; D013276:Stomach Ulcer / Q000150:complications*
vernacular_title: Khronobiologicheskie izmeneniia u bol'nykh s perforativnymi iazvami zheludka i dvenadtsatiperstnoĭ kishki.