THE RECTAL MUCOSA IN PATIENTS WITH CROHN'S ANAL FISTULAE HARBOURS LOWER NUMBERS OF BIFIDOBACTERIA, AND THE FISTULA TRACTS ARE DEVOID OF A MICROBIAL ECOSYSTEM - Tozer,P; Rayment,N; Al-Hassi,OH; Murguranathan,A; Daulatzai,N; Knight,SC; Phillips,RK; Whelan,K; Hart,AL (B M J PUBLISHING GROUP, 2011)