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; ASLAN, Gönül; ALTINTAŞ, Engin; TEZCAN, Seda; SERİN, Mehmet Sami; EMEKDAŞ, Gürol (Turkish Journal of Gastroenterology, 2008)