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