RT Journal Article SR Electronic T1 Sedation for upper gastrointestinal endoscopy JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 832 OP 832 DO 10.1136/gut.32.7.832-a VO 32 IS 7 A1 Clark, R A1 Goy, J YR 1991 UL http://gut.bmj.com/content/32/7/832.2.abstract AB