Kuiper, D H Gastroscopic findings and fecal blood loss following aspirin administration. [electronic resource] - The American journal of digestive diseases Nov 1969 - 761-9 p. digital Publication Type: Journal Article ISSN: 0002-9211 Standard No.: 10.1007/BF02235965 doi Subjects--Topical Terms: ABO Blood-Group SystemAdultAspirin--adverse effectsBlood Group AntigensChromium IsotopesErythrocytesFeces--analysisGastrointestinal Hemorrhage--chemically inducedGastroscopyHumansOccult BloodProthrombin--analysisSalicylates--blood