Randomized Contorolled Trial of efficacy of mosapride plus omeprazole versus omeprazole alone in therapy of gastroesophageal reflux disease

INTERVENTION: omeprazole 10mg qd after breakfast for 4 weeks omeprazole 10mg qd after breakfast plus mosapride 5mg tid for 4 weeks CONDITION: gastroesophageal reflux disease PRIMARY OUTCOME: The primary efficacy endpoint is; improvement in the FSSG(Frequency Scale for the Symptoms of GERD).The FSSG was performed before the study.After 4 weeks of therapy with either regimen, FSSG was performed again.The levels of the improvement of the GERD symptom are compared in omeprazole and omeprazole plus mosapride . SECONDARY OUTCOME: 1.GSRS score after 4 weeks; 2.FSSG score stratified by nonerosive GERD and erosive GERD INCLUSION CRITERIA: Patient who fills everything the following 1)Patient with GERD(erosive and nonerosive) 2)Patient of 20 years or more 3)Patient who gives written informed consent 4)Outpatient and in‐patient