5. Patients administrated with any drugs that can affect the efficacy of study regimen (proton pump inhibitors, revaprazan, prokinetics, H2-blockers, etc.) within 2 weeks (however, 4 weeks for PPIs) prior to enrollment and/or those who are required of NSAIDs, anti-coagulants, anti-cholinergics, prostaglandin E, corticosteroids, and anti-depressants treatment during the study period.