Remarks: For patient who fails to eradicate H. pylori infection at the end of study will be given levofloxacin-based triple therapy as rescue regimen(Esomeprazole 40 mg bid + levofloxacin 500mg daily, amoxicillin 1000mg bid) for 10 days.(Liou et al. 2010) Urea Breath Test (UBT) after 10 weeks and follow up appointment will be arranged to the patient.