1. Department of Laboratory Medicine; Shinshu University Hospital; Asahi 3-1-1 Matsumoto 390-8621 Japan
2. Department of Laboratory Medicine; Shinshu University School of Medicine; Asahi 3-1-1 Matsumoto 390-8621 Japan
3. Department of Neurosurgery; Shinshu University School of Medicine; Asahi 3-1-1 Matsumoto 390-8621 Japan
4. Division of Hematology, Department of Internal Medicine; Shinshu University School of Medicine; Asahi 3-1-1 Matsumoto 390-8621 Japan