1. Department of Emergency Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
2. Clinical Evidence Research, National Evidence-based Healthcare Collaborating Agency (NECA), Seoul, Korea
3. Department of Statistics, Graduate School of Chung-Ang University, Seoul, Korea
4. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea
6. Center for Liver and Pancreatobiliary Cancer, National Cancer Center, Goyang, Korea
7. Department of Internal Medicine, Nowon Eulji Medical Center, Eulji University College of Medicine, Seoul, Korea
8. Department of Internal Medicine, St. Vincent’s Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea
9. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
10. Department of Internal Medicine, Soonchunhyang University College of Medicine, Cheonan, Korea
11. Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea