1. Department of Preventive Medicine, College of Medicine, Kosin University, Pusan, Korea 602-202
2. Division of Epidemiology, School of Public Health, and
3. Institute for Nutrition Research, University of Oslo, N-0316 Oslo, Norway
4. Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN 55454
5. Division of Preventive Medicine, School of Medicine, and
6. Birmingham Veterans Affairs Medical Center, Birmingham, AL 35233
7. Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, AL 35205