Figure 1From: Quality of vitamin K antagonist control and outcomes in atrial fibrillation patients: a meta-analysis and meta-regressionFlow diagram showing results of the literature search. CCTR = Cochrane Central Register of Controlled Trials; RCT = randomized controlled trial; OBS = observational; AF = atrial fibrillation; VKA = vitamin K antagonist; INR = international normalized ratio; TTR = time in therapeutic range; PINRR = proportion of INR measurements in range.Back to article page