Celiac DiseaseBiopsyGlutensGliadinDiet, Gluten-FreeTransglutaminasesReticulinDermatitis HerpetiformisBiopsy, NeedleDuodenumImmunoglobulin AJejunumIntestinal MucosaHLA-DQ AntigensIntestine, SmallAutoantibodiesProlaminsAvena sativaInterleukin-18 Receptor beta SubunitDiet TherapyAtrophyHLA-DR3 AntigenIgA DeficiencyHLA-DR7 AntigenMalabsorption SyndromesEndoscopy, GastrointestinalSerologic TestsDiet, Protein-RestrictedDuodenoscopyWheat HypersensitivityLactuloseAntibodiesImmunoglobulin GAutoimmune DiseasesDuodenitisPrevalenceCase-Control StudiesImage-Guided BiopsyLymphoma, T-CellSteatorrheaCapsule EndoscopyEndoscopy, Digestive SystemJejunal NeoplasmsBiopsy, Large-Core NeedleEnzyme-Linked Immunosorbent AssaySensitivity and SpecificityIntestinal NeoplasmsJejunal DiseasesEnteritisIntestinal DiseasesBiopsy, Fine-NeedleEnteropathy-Associated T-Cell LymphomaColitis, MicroscopicEnterocytesCrohn DiseaseEosinophilic EsophagitisRetrospective Studies