Patient Outcomes and Cost of Referral Patterns of Patients With Proton Pump Inhibitor Refractory Gastroesophageal Reflux Disease Undergoing Esophageal pH and Impedance Testing: 374. (October 2017) - Dulaney, David T.; Barker, Darrell F.; Stratton, Amy N.; Dion, Gregory R.; Gancayco, John