1 Division of Laboratory and Transfusion Medicine, Hokkaido University Hospital, Sapporo, Japan.
2 Department of Respiratory Medicine, Hokkaido University Faculty of medicine, Sapporo, Japan.
3 Department of Hematology, Hokkaido University Faculty of medicine, Sapporo, Japan.
4 Division of Laboratory and Transfusion Medicine, Hokkaido University Hospital, Sapporo, Japan; Department of Hematology, Hokkaido University Faculty of medicine, Sapporo, Japan. Electronic address: [email protected].