P.01.6: Vigor of Contraction is Directly Related to Esophageal Chemical Clearance (PSPW Index). (15th March 2017) - Fani, B.; Savarino, E.; Martinucci, I.; Tolone, S.; Frazzoni, M.; Frazzoni, L.; Ceccarelli, L.; Furnari, M.; Surace, L.; Ricco, G.; Laino, G.; Savarino, V.; et al.