Predictors of vitamin B-12 deficiency: Age and helicobacter pylori load of antral mucosa - GÜMÜRDÜLÜ, Yüksel; SERİN, Ender and ÖZER, Birol and KAYASELÇUK, Fazilet and KUL, Kemal and PATA, Cengiz and GÜÇLÜ, Mustafa and GÜR, Gürden and BOYACIOĞLU, Sedat (Turkish Journal of Gastroenterology, 2003)