Yu, Chaohui Adoption of a sitting position in transnasal gastroscopy: a new approach. [electronic resource] - The American journal of gastroenterology Mar 2009 - 790-1 p. digital Publication Type: Letter ISSN: 1572-0241 Standard No.: 10.1038/ajg.2008.92 doi Subjects--Topical Terms: Cough--complicationsEsophageal Fistula--diagnosisEsophagoscopyFemaleGastroscopy--methodsHumansMiddle AgedNosePosture