1. Department of Pediatrics; Shinshu University School of Medicine; Matsumoto Japan
2. Division of Hematology, Oncology, and Immunology; Nagano Children's Hospital; Azumino Japan
3. Department of Pediatrics; School of Medicine; Institute of Medical, Pharmaceutical and Health Sciences; Kanazawa University; Kanazawa Japan
4. Division of Transfusion Medicine; Cell Processing Center; Shinshu University Hospital
5. Department of Infection and Host Defense; Shinshu University, Graduate School of Medicine; Matsumoto Japan