1. Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea.
2. Department of Internal Medicine, Gumi CHA Hospital, Gumi, Korea.
3. Department of Internal Medicine, Masan Samsung Medical Center, Masan, Korea.
4. Department of Internal Medicine, College of Medicine, Kosin University, Busan, Korea.
5. Department of Internal Medicine, Daegu Catholic University Hospital, Daegu, Korea.
6. Department of Internal Medicine, Keimyung University Dongsan Medical Center, Daegu, Korea.