Impact of interobserver disagreement on phenotype-genotype associations in Crohn's disease.
BACKGROUND: Nonvalidated definitions of disease-related parameters in inflammatory bowel disease cause variations in diagnosis and disease classification. We determined interobserver agreement on applications of definitions of the Vienna Classification variables and computed the potential influence of misclassification on genotype/phenotype associations. METHODS: Ten records of patients with Crohn's disease (CD) were independently evaluated by 19 observers using a standardized inflammatory b...Expand abstract
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