1. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
2. Department of Internal Medicine, Pusan National University School of Medicine, Yangsan, Korea
3. Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea
4. Liver Cirrhosis Clinical Research Center, Seoul, Korea
5. Department of Gastroenterology and Hepatology, Kyungpook National University, Daegu, Korea
6. Brain Korea 21 Project for Medical Science, Seoul, Korea