1. Department of Internal Medicine, Konyang University College of Medicine, Daejeon, Korea
2. Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea
3. Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea
4. Department of Internal Medicine, Dankook University College of Medicine, Cheonan, Korea
5. Department of Internal Medicine, Soonchunhyang University College of Medicine, Cheonan, Korea
6. Department of Internal Medicine, Eulji University Hospital, Daejeon, Korea
7. Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Korea
8. Department of Internal Medicine, Daejeon St. Mary’s Hospital, The Catholic University of Korea College of Medicine, Daejeon, Korea