Qizilbash, A H Endoscopic brush cytology and biopsy in the diagnosis of cancer of the upper gastrointestinal tract. [electronic resource] - Acta cytologica - 313-8 p. digital Publication Type: Journal Article ISSN: 0001-5547 Subjects--Topical Terms: BiopsyCytodiagnosisDuodenal Neoplasms--diagnosisEndoscopyEsophageal Neoplasms--diagnosisEsophagoscopyGastroscopyHumansStomach Neoplasms--diagnosis