1. Department of Pediatrics, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan.
2. Department of Anesthesiology and Critical Care, Hiroshima University Hospital, Hiroshima, Japan.
3. Department of Hematology and Oncology, Shizuoka Children's Hospital, Shizuoka, Japan.
4. Department of Psychiatry and Neurosciences, Hiroshima University, Hiroshima, Japan.