Sen. Ron Johnson (R-Wis.) in letters this week requested records from two prominent medical journalists regarding studies they retracted last year. One study claimed that the anti-malarial hydroxychloroquine was linked to an increased risk of mortality among COVID-19 patients. The findings of the study were widely circulated, as hydroxychloroquine drew many opponents after it was promoted by then-President Donald Trump. But it was retracted by The Lancet in June 2020, about two weeks after it was published. Researchers said Surgisphere, a Chicago-based company that employed one of the researchers who worked on the study, refused to share the dataset allegedly containing the records, prompting the other three authors to request a retraction. The other study was published in May of last year by the New England Journal of Medicine (NEJM). Researchers said they found that taking certain blood pressure drugs did not appear to increase the risk of death among those with …