Fig. 2From: Comparison of clinical outcomes following percutaneous coronary intervention versus optimal medical therapy based on gray-zone fractional flow reserve in stable angina patients with intermediate coronary artery stenosis (COMFORTABLE prospective study): Study protocol for a multicenter randomized controlled trialSPIRIT schedule of enrollment, intervention, and assessments. *If clinically indicated. FFR Fractional flow reserve, PCI Percutaneous coronary interventionBack to article page