Department of Preventive Medicine, College of Medicine, Ewha Womans University and Ewha Womans Medical Research Institute, Korea.
1Korea Occupational Safety and Health Research Institute, Korea.
2Media Research, Korea.
3Radiation Health Research Institute, Korea.
4Department of Preventive Medicine, College of Medicine Dankook University, Korea.
Copyright © 2003. Ewha Womans University School of Medicine
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.