OC.09.1 HIGH RESOLUTION MANOMETRY IS SUPERIOR TO ENDOSCOPY AND RADIOLOGY IN ASSESSING AND GRADING SLIDING HIATAL HERNIA. A PROSPECTIVE COMPARISON WITH SURGICAL IN VIVO. Issue 2 (15th March 2018) - Coletta, M. Della; Savarino, E.; Zaninotto, G.; De Bortoli, N.; Furnari, M.; Frazzoni, M.; Frazzoni, L.; Savarino, V.; Docimo, L.; Tolone, S.