Study participants
MUCOUS MEMBRANE DISORDER, EROSIVE OESOPHAGITIS
At the start of the healing phase, eligible patients were aged ≥ 20 years, Patients were eligible to enter the maintenance phase if they had endoscopically confirmed erosive oesophagitis healing (defined as Grade 0 according to severity classification of erosive oesophagitis, i.e. no mucous membrane disorder) on completion of the healing phase (week 4 or 8). Patients were excluded from the maintenance phase if they received a PPI other than vonoprazan or lansoprazole during the healing phase.