OC.09.6 CLINICAL AND IMPEDANCE-PH FACTORS ASSOCIATED TO PPI RESPONSE IN PATIENTS WITH WITH EXTRAESOPHAGEAL SYMPTOMS SUGGESTIVE OF GERD. Issue 2 (15th March 2018) - Svizzero, G. Baiano; Savarino, E.; Frazzoni, M.; Mauro, A.; Tolone, S.; Casini, V.; Efthymakis, K.; Frazzoni, L.; Martinucci, I.; Marabotto, E.; Zentilin, P.; Pace, F.; et al.