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