Comparison of bismuth-containing quadruple and concomitant therapies as a first-line treatment option for Helicobacter pylori - UYGUN, Ahmet; KADAYIFÇI, Abdurrahman; POLAT, Zülfikar; KANTARCIOĞLU, Murat; KİLCİLER, Güldem and Başar, Ömer and ÖZCAN, Ayhan and EMER, Özdeş (Turkish Journal of Gastroenterology, 2012)