National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine treatment outcome research support non-u.s. gov't female male middle aged Drug Administration Schedule Comparative Study Clinical Trial Randomized Controlled Trial Double-Blind Method Multicenter Study amoxicillin / therapeutic use* clarithromycin / therapeutic use* drug therapy enzyme inhibitors / therapeutic use* pmid:9398894 doi:10.1111/j.1523-5378.1996.tb00027.x t lind s veldhuyzen van zanten j p idström amoxicillin / administration & dosage anti-ulcer agents / administration & dosage anti-ulcer agents / therapeutic use* clarithromycin / administration & dosage combination / administration & dosage combination / therapeutic use* duodenal ulcer / drug therapy* duodenal ulcer / etiology enzyme inhibitors / administration & dosage gastritis / complications gastritis / drug therapy* helicobacter infections / complications helicobacter infections / drug therapy* helicobacter infections / microbiology helicobacter pylori / drug effects* metronidazole / administration & dosage metronidazole / therapeutic use* omeprazole / administration & dosage omeprazole / therapeutic use*