1. Department of Internal Medicine II, Shimane University Faculty of Medicine , 89-1 Enya-cho, Izumo, Shimane 693-8501 , Japan
2. Division of Hepatology, Shimane University Hospital , 89-1 Enya-cho, Izumo, Shimane 693-8501 , Japan
3. Inflammatory Bowel Disease Center, Shimane University Hospital , 89-1 Enya-cho, Izumo, Shimane 693-8501 , Japan