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Efendi, D.; Effendi, R.; Dairy, L. B.; Sembiring, J.; Marpaung, B.; Sihombing, M.; Soetadi, S. M.; Zain, L. H. Level of Gastrin Serum and Ulcer Size on Gastric Ulcer Correlated to Helicobacter Pylori Infection. InaJGHE 2009, 10, 113-116.