RT Journal Article SR Electronic T1 Probiotics in human medicine. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 439 OP 442 DO 10.1136/gut.32.4.439 VO 32 IS 4 A1 R Fuller YR 1991 UL http://gut.bmj.com/content/32/4/439.abstract AB