RT Journal Article SR Electronic T1 The normal colonic bacterial flora. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 318 OP 323 DO 10.1136/gut.16.4.318 VO 16 IS 4 A1 Hill, M J A1 Drasar, B S YR 1975 UL http://gut.bmj.com/content/16/4/318.abstract AB