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Cardiovascular disease is known to rank first as a cause of death among the elderly in Korea.Follow-up survey was conducted in 2007 to measure the intima-media thickness of carotid artery,which is known as a preclinical marker of atheroscleroticchange,among participants of Hallym Aging Study (HAS),a longitudinal study assessing the quality of life among elderly in Korea.The baseline survey was performed in 2004.