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agricultural soil science(1)
analysis of variance(1)
case-control studies(1)
cohort studies(1)
database searching(1)
erosion(1)
factorial design(1)
flow rate(1)
gastric cancer(1)
geographic areas(1)
helicobacter pylori(1)
linear regression analysis(1)
loess(1)
meta-analysis(1)
observational studies(1)
sediment(1)