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 Clinical Pathology, School of Medicine, Kyungpook National University, Daegu, Korea.