1. Division of Gastroenterology, Department of Internal Medicine, Yonsei University College of Medicine, Liver Cirrhosis Clinical Research Center, Seoul, Korea.
2. Division of Endocrinology and Metabolism, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
3. Executive Healthcare Clinic, Severance Hospital, Yonsei Health System, Seoul, Korea.
4. Division of Endocrinology and Metabolism, Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.