Affiliation: | 1. Department of Internal Medicine, Yonsei University College of Medicine, , Seoul, Korea;2. Department of Preventive Medicine, Yonsei University College of Medicine, , Seoul, Korea;3. Department of Yonsei Institute of Gastroenterology, Yonsei University College of Medicine, , Seoul, Korea;4. Liver Cirrhosis Clinical Research Center, , Seoul, Korea;5. Brain Korea 21 Project for Medical Science, , Seoul, Korea |