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