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1Department of Social and Preventive Medicine, Sungkyunkwan University School of Medicine, Suwon, Korea.
2Center for Communicable Disease Surveillance and Response, Korea Centers for Disease Control and Prevention, Seoul, Korea.
3Department of Pediatrics, Yonsei University College of Medicine, Seoul, Korea.
4National Institute of Scientific Investigation, Daejeon, Korea.
5Public Health, Social Welfare, and Women's Affairs Department, Daegu, Korea.
6Department of Pathology, Kyungpook University School of Medicine, Daegu, Korea.
7Department of Pathology, Dongguk University College of Medicine, Gyeongju, 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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