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1Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea
2Cardiovascular and Metabolic Diseases Etiology Research Center, Yonsei University College of Medicine, Seoul, Korea
3Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea
4Department of Sociology, Yonsei University College of Social Sciences, Seoul, Korea
5Department of Clinical Nursing Science, Yonsei University College of Nursing, Seoul, Korea
6Division of Silver Industry, Kangnam University, Yongin, Korea
Copyright © 2014, Korean Society of Epidemiology
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