Clin. exp. gastroenterol. Clin. exp. gastroenterol. Fecal microbiota profiles in treatment-naive pediatric inflammatory bowel disease - associations with disease phenotype, treatment, and outcome Olbjern C. Smastuen M.C. Thiis-Evensen E. Nakstad B. Vatn M.H. Jahnsen J. Ricanek P. Vatn S. Moen A.E.F. Tannaes T.M. Lindstrom J.C. Soderholm J.D. Halfvarson J. Gomollon F. Universidad de Zaragoza Casen C. Karlsson M.K. Kalla R. Adams A.T. Satsangi J. Perminow G. 2019 research-article