1. Department of Internal Medicine, Inje University College of Medicine, Goyang, Korea
2. Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Korea
3. Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea
4. Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea
5. Department of Internal Medicine, Daegu Catholic University School of Medicine, Daegu, Korea
6. Department of Internal Medicine, Daegu Fatima Hospital, Daegu, Korea