Author E. van Soest V. Valkhoff G. Mazzaglia R. Schade M. Molokhia J. Goldstein S. Hernandez-Diaz G. Trifiro J. Dieleman E. Kuipers M. Sturkenboom Year of Publication 2011 DOI 10.1136/gut.2011.239848 DOIGoogle ScholarBibTeXEndNote X3 XMLEndNote 7 XMLEndnote taggedMarcRIS