RT Journal Article SR Electronic T1 Artificial Nutrition Support in Clinical Practice, 2nd edn JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 456 OP 456 DO 10.1136/gut.52.3.456-a VO 52 IS 3 A1 J Powell-Tuck YR 2003 UL http://gut.bmj.com/content/52/3/456.2.abstract AB