1 Unit of Gastroenterology and Digestive Endoscopy, IRCCS Casa Sollievo della Sofferenza Hospital, San Giovanni Rotondo, Italy. f.bossa@operapadrepio.it.
2 Unit of Gastroenterology and Digestive Endoscopy, IRCCS Casa Sollievo della Sofferenza Hospital, San Giovanni Rotondo, Italy.
3 Unit of Pathologic Anatomy, IRCCS Casa Sollievo della Sofferenza Hospital, San Giovanni Rotondo, Italy.