1. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Kashiwazaki Central Hospital, 2-1-25 Ekimae, Niigata, Kashiwazaki 9450055, Japan
2. Division of Gastroenterology and Hepatology, Kashiwazaki General Hospital and Medical Center, 2-11-3 Kitahanda, Kashiwazaki, Niigata, 9458535, Japan
3. Division of Cardiology, Department of Internal Medicine, Kashiwazaki Central Hospital, 2-1-25 Ekimae, Niigata, Kashiwazaki 9450055, Japan
4. Division of Endocrinology and Metabolism, Department of Internal Medicine, Kashiwazaki Central Hospital, 2-1-25 Ekimae, Niigata, Kashiwazaki 9450055, Japan
5. Department of Surgery, Kashiwazaki Central Hospital, 2-1-25 Ekimae, Niigata, Kashiwazaki 9450055, Japan