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Analysis of the gastric acid pocket

To obtain fluid from the the gastric acid pocket to:1.) Compare fluid of patients on ppi, patients with Barrett's esophagus and volunteers2.) to assess the properties of the fluid to develop a reliable in vitro model

Effect of left and right lateral positioning on gastroesophagel reflux (GER) and underlying mechanisms in GER disease patients and healthy controls

To investigate the influence of left and right lateral position on the onset of TLESRs and GER and the underlying mechanisms during and after a test meal in GERD patients compared to healthy controls.