Inclusion Criteria:  Age ≥ 19 years old Evidence of myocardial ischemia and coronary artery diameter stenosis≥ 50% and lesion length ≥ 25mm At least 2.5 mm diameter coronary vessel by visual estimation Patients treated with Zotarolimus-eluting stent  Exclusion Criteria:  Previous coronary stent implantation Patients perticipated in other clinical trials of drugs or device Target vessel saphenous vein graft In-stent re-stenosis lesion Contraindicated to anti-platelet agents or hypersensitivity Past history of malignancy within 5 years History of anaphylaxis to contrast agent Pregnancy and lactation Life expectancy < 1-year End stage renal disease on dialysis