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Table 1 Research questions explored by the review

From: Helicobacter pylori infection and circulating ghrelin levels - A systematic review

Research question

Explanatory data

Is H pylori infection associated with circulating ghrelin levels?

Data comparing circulating ghrelin concentration in H pylori positive and negative subjects

What is the effect of eradicating H pylori on circulating ghrelin levels?

Data comparing the circulating ghrelin concentration before and after H pylori eradication

What is the effect of H pylori infection on ghrelin expression in the stomach?

Data assessing any of the gastric ghrelin parameters