1. First Department of Internal Medicine, Hokkaido University Hospital, Hokkaido
2. Division of Laboratory and Transfusion Medicine, Hokkaido University Hospital, Hokkaido
3. Department of Laboratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
4. Second Department of Internal Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan