RT Journal Article SR Electronic T1 Nutrition and its Disorders JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 340 OP 340 DO 10.1136/gut.22.4.340-a VO 22 IS 4 A1 Heaton, K W YR 1981 UL http://gut.bmj.com/content/22/4/340.2.abstract AB