the growth of Helicobacter pylori bacteria in the stomach , which contributes to the appearance of ulcerspreventthe growth of Helicobacter pylori bacteria in the stomach , which contributes to the appearance of ulcers
the growth of Helicobacter pylori bacteria in the stomach that contributes to the formation of ulcerspreventthe growth of Helicobacter pylori bacteria in the stomach that contributes to the formation of ulcers