Abstract Background Mendelian randomization (MR) studies using Genetic risk scores (GRS) as an instrumental variable (IV) have increasingly been used to control for unmeasured confounding in observational healthcare databases. However. proper reporting of methodological issues is sparse in these studies. We aimed to review published papers related to MR studies and identify reporting ... https://www.chiggate.com/trea-turner-philadelphia-phillies-autographed-major-league-baseball-on-sale/