The main objective of this study is to determine the risk factors and etiologies of ischemic stroke in Korean young adults. Both well-documented risk factors and little known life-style related risk factors such as life-style habits, psychological distress including occupational distress, perceived stress and depression will be evaluated by comparison with healthy controls using a structured questionnaire. Secondary objectives are to determine stroke outcomes such as mortality, recurrent vascular events and post-stroke epilepsy in these patients.