The effect of decrease in serum nitric oxide concentration on portal hemodynamics after Helicobacter pylori treatment: An open-label pilot study - SERİN, Ender; POURBAGHER, M. Ali; GÜMÜRDÜLÜ, Yüksel; TAMER, Lülüfer; ÖZER, Birol; YILMAZ, Uğur (Turkish Journal of Gastroenterology, 2008)