Fifty-two sex - and age-matched patients at the first diagnosis of H. pylori infection were randomized 1:1 into two different therapeutic schemes : ( 1 ) standard LCA ( 26 patients ) : lansoprazole 15 mg bid , clarithromycin 500 mg bid and amoxicillin 1,000 mg bid for 7 days with a common diet ; ( 2 ) standard LCA plus a nickel free-diet ( NFD-LCA ) ( 26 patients ) .