S445 Severity of Reflux Predicts Number of Days Abnormal on Ambulatory Reflux Testing: Discovery and External Validation Cohort Study. (October 2022) - Hayat, Muhammad Hashim; Kapil, Neil; Goss, James; Sarker, Shabnam; Slaughter, James; Patel, Dhyanesh; Vaezi, Michael F.; Naik, Rishi D.