title: [Dependence of roentgen-negative data in duodenal bulb ulcer on the location, phase and extent of ulcerous defects].
mesh_terms: D004381:Duodenal Ulcer / Q000175:diagnosis* / Q000000981:diagnostic imaging; D004386:Duodenum; D004724:Endoscopy; D005069:Evaluation Studies as Topic; D006801:Humans; D011859:Radiography
vernacular_title: Zavisimost' rentgenootritsatel'nykh dannykh pri iazve lukovitsy dvenadtsatiperstnoĭ kishki ot lokalizatsii, fazy i razmera iazvennykh defektov