“…However, one must take into account the major challenges to be overcome to produce a quality meta-analysis with the selection of studies to be included, identify potential biases, heterogeneity, quality of studies, incomplete data, reporting bias (publications only with favorable data), and the ability to generalize. 8 The authors 7 systematically searched PubMed, Embase, and Cochrane Library for eligible studies from the start of the pandemic until December 2022, including those that compared COVID-19 outcomes in patients with and without prior chronic oral anticoagulation for AF. The selection work used a rigorous protocol seeking publications with higher quality and less chance of bias, which is essential in the case of observational studies.…”