“…Among all the remaining patients, those whose malabsorption symptoms persisted despite at least 12 months of a gluten-free diet and in whom a diagnosis of complicated CD was made were selected. More specifically, the diagnosis of RCD2 was based on a flat duodenal mucosa not responding to 12 months on a gluten-free diet and evidence of an aberrant intraepithelial lymphocyte population and/or gamma chain T cell monoclonal rearrangement; diagnosis of RCD1 was based on a flat duodenal mucosa not responding to 12 months on a gluten-free diet but without the diagnostic criteria for RCD2; finally, the diagnoses of EATL, ABL, UJI, and SBC were based on morphological criteria [9][10][11][12]. For all these patients, the following information was collected: sex, date of birth, date of diagnosis of CD, date of the last examination at the centre, date of diagnosis of complications of CD, if applicable, and date of death, if applicable.…”