1. Department of Dentistry, College of Medicine, Yeungnam University, Daegu, Korea.
2. Department of Internal Medicine, College of Medicine, Yeungnam University, Daegu, Korea.
3. Department of Epidemiology and Biostatistics, Center for Research in Nutrition and Health Disparities, Arnold School of Public Health, University of South Carolina, Columbia, USA.
4. Department of Preventive Dentistry, School of Dentistry, Kyungpook National University, Daegu, Korea.
5. Faculty of Health Science, Daegu Haany University, Gyeongsan, Korea.
6. Department of Preventive Medicine, School of Medicine, Kyungpook National University, Daegu, Korea.