Planned analysis: Descriptive statistics will be provided. The investigators will assess geographic association between distribution of thrombus within scaffold and abnormal findings assessed by OCT. Statistical analyses will be performed with R (R Foundation for Statistical Computing, Vienna, Austria). Continuous variables will be summarized as mean ± standard deviation or median ± 95% confidence interval, depending on normality of distribution. The investigators will assess underlying reasons for scaffold thrombosis based on the same methodology with previous publication.(6)