1. Department of Laboratory Medicine, Tokyo Metropolitan Children’s Medical Center, Fuchu 183-8561, Japan
2. Clinical Research Support Center, Tokyo Metropolitan Children’s Medical Center, Fuchu 183-8561, Japan
3. Department of Hematology/Oncology, Tokyo Metropolitan Children’s Medical Center, Fuchu 183-8561, Japan
4. Department of Pediatric Hematology/Oncology, Osaka City General Hospital, Osaka 534-0021, Japan
5. Children’s Cancer Center, National Center for Child Health and Development, Tokyo 157-8535, Japan
6. Department of Pediatrics, Nagoya University Graduate School of Medicine, Nagoya 466-8560, Japan
7. Department of Pediatrics, Hokkaido University Hospital, Sapporo 060-8648, Japan
8. Department of Pediatric Surgery, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
9. Department of Pediatrics, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan