1. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Korea.
2. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
5. Department of Internal Medicine, Inje University College of Medicine, Busan, Korea.