1. Department of Preventive Medicine, Catholic University of Daegu School of Medicine, Daegu, Korea.
2. Department of Preventive Medicine, Kyungpook National University School of Medicine, Daegu, Korea.
3. National Cancer Control Institute, National Cancer Center, Goyang, Korea.
4. Division of Health and Science, Yeungnam College of Science and Technology, Daegu, Korea.
5. Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea.
6. Department of Preventive Medicine & Public Health, Yeungnam University College of Medicine, Daegu, Korea.