1. Department of Internal Medicine, School of Medicine, Kyungpook National University, Kyungpook National University Hospital, Daegu, Korea.
2. Department of Internal Medicine, School of Medicine, Kyungpook National University, Kyungpook National University Chilgok Hospital, Daegu, Korea.
3. Department of Infectious Disease, Daegu Fatima Hospital, Daegu, Korea.
4. Department of Infectious Disease, Keimyung University Dongsan Medical Center, Daegu, Korea.
5. Department of Internal Medicine, Yeungnam University Medical Center, Daegu, Korea.
6. Department of Internal Medicine, Catholic University of Daegu School of Medicine, Daegu, Korea.