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1Department of Preventive Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2Clinical Research Center for Depression, Seoul, Korea.
3Department of Occupational and Environmental Medicine, The Catholic University of Korea, St. Mary's Hospital, Seoul, Korea.
4Department of Psychiatry, School of Medicine, Kangwon National University, Chuncheon, Korea.
5Department of Psychiatry, School of Medicine, Kyungpook National University, Daegu, Korea.
© 2010, Korean Society of Epidemiology
This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The authors have no conflict of interest to declare on this study.
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