Determination of primary resistance of Helicobacter pylori isolates to clarithromycin and amoxicilin by disc difussion method and the comparison with resistance in recurrent cases - PALABIYIKOĞLU, Murat; ŞAHİN, Fikret; ÖZDEN, Ali; UZUNALİMOĞLU, Özden (Turkish Journal of Gastroenterology, 1997)