Incidence and evolution of foreign body impaction in the upper gastrointestinal tract and its relationship with eosionophilic oesophagitis Paula Arratibel; Ines Gil-Lasa; Julyssa Cobian; Arantzazu Izagirre-Arostegi; Teresa Arzallus; Ane Etxart; Cristina Sarasqueta; Leire Zubiaurre; Luis Bujanda;