1. Department of Hematology, Kyushu Railway Memorial Hospital, Kitakyushu, Japan,
2. Department of Gastroenterology, Kyushu Railway Memorial Hospital, Kitakyushu, Japan,
3. Department of Hepatology, Kyushu Railway Memorial Hospital, Kitakyushu, Japan,
4. Department of Internal Medicine, Kyushu Railway Memorial Hospital, Kitakyushu, Japan,
5. Department of Laboratory Medicine & Surgical Pathology, Kyushu Railway Memorial Hospital, Kitakyushu, Japan,
6. Department of Pathology, Kurume University School of Medicine, Kurume, Japan