[1]
Ümit B. DOĞAN, C. TUNÇER, A. DURSUN, and U. KANDİLCİ, “Association of duodenal bulb Helicobacter pylori with duodenal ulcer and its relapses”, Turkish Journal of Gastroenterology, vol. 8, no. 3, pp. 313–317, Jan. 1997.