Nitric oxide oxidation products in the serum of patients with gastric and esophageal cancer and Helicobacter pylori - TÜRKDOĞAN, M. Kürşat; TESTERECİ, Haluk; KAHRAMAN, Tahir; DİLEK, F. Hüsniye; AKMAN, Emel (Turkish Journal of Gastroenterology, 1999)