%0 Journal Article %T Apixaban in Comparison to Warfarin for Stroke Prevention in Nonvalvular Atrial Fibrillation: A Systematic Review and Meta-Analysis of Observational Studies %A David Scalzitti %A Muhammad U. Siddiqui %A Zunaira Naeem %J Archive of "Cardiology Research and Practice". %D 2019 %R 10.1155/2019/6419147 %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6642773/