1. Department of Internal Medicine, Daegu Veterans Hospital, Daegu, Korea.
2. Division of Cardiology, Department of Internal Medicine, Yeungnam University Medical Center, Yeungnam University College of Medicine, Daegu, Korea.
3. Division of Endocrinology, Department of Internal Medicine, Yeungnam University Medical Center, Yeungnam University College of Medicine, Daegu, Korea.
4. Department of Chemical Pathology, Yeungnam University Medical Center, Yeungnam University College of Medicine, Daegu, Korea.
5. Department of Chemical Pathology, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, Korea.