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Dear Editor, We were interested in the paper by Chen et al. (1) published in January 2019, wherein the coronary chronic total occlusion (CTO) was defined as complete occlusion, and confirmed with coronary angiography over a period of three months with a prevalence of 20% to 30%. Thedoi:10.3348/kjr.2019.0062 fatcat:u5cpogmqybcipbkt6pdhfhgbt4