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Increased Tryptophan Metabolism is Associated With Activity of Inflammatory Bowel DiseasesNikolaus, Susanna; Schulte, Berenice; Al-Massad, Natalie; Thieme, Florian; Schulte, Dominik M.; Bethge, Johannes; Rehman, Ateequr; Tran, Florian; Aden, Konrad; Häsler, Robert; Moll, Natalie; Schütze, Gregor; Schwarz, Markus J.; Waetzig, Georg H.; Rosenstiel, Philip; Krawczak, Michael; Szymczak, Silke; Schreiber, Stefan · Gastroenterology · 2017