Helicobacter pylori moderates the association between 5-MTHF concentration and cognitive function in older adults [1] [1] Berrett AN, Gale SD, Erickson LD, Brown BL, Hedges DW Helicobacter pylori moderates the association between 5-MTHF concentration and cognitive function in older adults PloS one. 2018 Jan;13(1):e0190475. doi: journal.pone.0190475