Glycyrrhetinic asit, streptococcus thermophilus ve lactobacillus casei'nin helicobacter pylori'ye karşı in-vitro, in-vivo etkinliği ve moleküler mekanizmaları In-vitro, in-vivo activity and molecular mechanisms of glycyrrhetinic acid, streptococcus thermophilus and lactobacillus casei against helicobacter pylori