7Masaoka T, Suzuki H, Kurubayashi K, et al. Could frameshifl mu - ra- tionsin the frxA and rdxA genes of Helicobacter pyloribe amaker or met- ronida - zole resistance [ J ]. Aliment Pharmacol Ther, 2006,2 ( 1 ) : 81 - 87.
8Li Z,Zou D,Ma X,et al.Epedemiolgy of peptic ulcer disease:endoscopic results of the systematic investigation of gastrointestinal disease in China[J].Am J Gastroenterol,2010,105(12):2570-2577.
