RT Journal Article SR Electronic T1 Microbial Ecology of the Gut JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 584 OP 584 DO 10.1136/gut.19.6.584-a VO 19 IS 6 A1 Hill, M. J. YR 1978 UL http://gut.bmj.com/content/19/6/584.2.abstract AB