1. Department of Internal Medicine, Kangwon National University School of Medicine, Chuncheon, Korea.
2. Department of Internal Medicine, Jeju National University School of Medicine, Jeju, Korea.
3. Department of Internal Medicine, Daegu Fatima Hospital, Deagu, Korea.
4. Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea.
5. Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
6. Department of Internal Medicine, Keimyung University Dongsan Medical Center, Daegu, Korea.
7. Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea.
8. Department of Internal Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea.
9. Department of Internal Medicine, Changwon Fatima Hospital, Changwon, Korea.