Effect of recruitment centre on intestinal microbial composition. A. Considering all samples (Oslo, Calgary, and Mount Sinai Hospital [MSH]), beta diversity [Bray Curtis Faith], and principal coordinate analysis [PCoA] demonstrate distinct clustering of samples by recruitment centre. B. Considering only ulcerative colitis [UC] samples [Oslo, Calgary, and MSH], beta diversity [Bray Curtis Faith] and PCoA demonstrate distinct clustering of samples by recruitment centre. C. Considering only primary sclerosing cholangitis [PSC] samples [Oslo and Calgary], beta diversity [Bray Curtis Faith] and PCoA demonstrate distinct clustering of samples by recruitment centre.