Denas, Gentian, et al. “Oral Anticoagulants in Low-Risk Atrial Fibrillation Patients: A Population-Based Study”. Cardiology and Cardiovascular Medicine, vol. 4, no. 1, Feb. 2020, pp. 66-75, http://www.fortunejournals.org/ojs/index.php/ccm/article/view/15791.