Fig. 1From: Underutilization of anticoagulants in patients with nonvalvular atrial fibrillation in the era of non-vitamin K antagonist oral anticoagulantsExtraction of study subject. AF, atrial fibrillation; AFL, atrial flutter; CHA2DS2-VASc, congestive heart failure, hypertension, age of ≥ 75 years [doubled], diabetes mellitus, prior stroke or transient ischemic attack [TIA] [doubled], vascular disease, age of 65 to 74 years, and sex; HIRA-APS, Health Insurance Review & Assessment Service-Aged Population Sample; NOAC, non-vitamin K antagonist oral anticoagulant; NVAF, nonvalvular atrial fibrillation; OAC, oral anticoagulantBack to article page