Detection of point mutations on 23S rRNA of Helicobacter pylori and resistance to clarithromycin with PCR-RFLP in gastric biopsy specimens in Mersin, Turkey - SEZGİN, Orhan and ASLAN, Gönül and ALTINTAŞ, Engin and TEZCAN, Seda and SERİN, Mehmet Sami and EMEKDAŞ, Gürol (Turkish Journal of Gastroenterology, 2008)