1. Department of Family Medicine, Kyungpook National University Medical Center, Daegu, Korea.
2. Department of Family Medicine, Kyungpook National University School of Medicine, Daegu, Korea.
3. Graduate School of Public Health, Kyungpook National University, Daegu, Korea.
4. Regional Cardiocerebrovascular Center, Kyungpook National University Hospital, Daegu, Korea.