P.02.13 DIAGNOSTIC ACCURACY OF ULTRASONOGRAPHY IN THE DETECTION OF POSTSURGICAL RECURRENCE IN CROHN'S DISEASE: A SYSTEMATIC REVIEW WITH META-ANALYSIS. Issue 2 (15th March 2018) - Imperatore, N.; Rispo, A.; Testa, A.; Nardone, O.M.; Opramolla, A.; Caporaso, N.; Castiglione, F.