title: Beneath the surface.
authors.affiliation: Department of Rheumatology and Clinical Immunology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands. h.a.martens@int.umcg.nl
authors.forename: H A
authors.initials: HA
authors.lastname: Martens
authors.forename: J J
authors.initials: JJ
authors.lastname: Koornstra
authors.forename: A
authors.initials: A
authors.lastname: Diepstra
authors.forename: H G
authors.initials: HG
authors.lastname: Sprenger
authors.forename: C G M
authors.initials: CG
authors.lastname: Kallenberg
mesh_terms: D016099:Endoscopy, Gastrointestinal; D005260:Female; D006801:Humans; D007082:Ileum / Q000473:pathology; D008875:Middle Aged; D008061:Whipple Disease / Q000175:diagnosis* / Q000473:pathology