The study and comparative analysis of GerdQ and GSRS Questionnaires on gastroesophageal reflux disease diagnostics - Zaika, Serhii; Paliy, Iryna; Chernobrovyi, Viacheslav; Oleksandrovych Ksenchyn, Oleh (Gastroenterology Review/Przegląd Gastroenterologiczny, 2020)