1. Department of Internal medicine Yonsei University College of Medicine Seoul Korea
2. Department of Internal Medicine Kyungpook National University School of Medicine Daegu Korea
3. Biostatistics Collaboration Unit Department of Biomedical Systems Informatics Yonsei University College of Medicine Seoul Korea
4. Yonsei Liver Center Severance Hospital Yonsei University Health System Seoul Korea
5. Institute of Gastroenterology Yonsei University College of Medicine Seoul Korea