Everolimus-eluting(PROMUS-ELEMENT) vs. Biolimus A9-Eluting(NOBORI) Stents for Long-Coronary Lesions

Inclusion Criteria: * The patient must be at least 18 years of age. * Significant native coronary artery stenosis (\>50% by visual estimate) with lesion length of more than 25mm, which requiring single or multiple long stent placement (\>=28mm) * Patients with silent ischemia, stable or unstable angina pectoris, ad Non-ST-elevation myocardial infarction * The patient or guardian agrees to the study protocol and the schedule of clinical and angiographic follow-up, and provides informed, written consent, as approved by the appropriate Institutional Review Board/Ethical Committee of the respective clinical site. Exclusion Criteria: * Any contraindication to any of the following medications: aspirin, heparin, clopidogrel, stainless steel, contrast agents, sirolimus, or everolimus. * An elective surgical procedure is planned that would necessitate interruption of antiplatelet drugs during the first 6 months post enrollment. * Acute ST-segment-elevation MI or cardiogenic shock * Terminal illness with life expectancy \<1 year * Patients who are actively participating in another drug or device investigational study, which have not completed the primary endpoint follow-up period. * In-stent restenosis at target vessel (either bare metal stent or drug-eluting stent segment, non-target vessel ISR is permitted) Patients with EF\<30%. * Serum creatinine level \>=3.0mg/dL or dependence on dialysis. * Patients with left main stem stenosis (\>50% by visual estimate).