SACHDEV, S1961-12-012009-05-301961-12-012009-05-301961-12-01SACHDEV S. Gastroscopy in upper abdominal distress with negative roentgenological examination. Journal of the Association of Physicians of India. 1961 Dec; 9(): 871-5http://imsear.searo.who.int/handle/123456789/89202engGastroenterology --diagnosisGastroscopyGastroscopy in upper abdominal distress with negative roentgenological examination.Journal Article