1. Faculty of Nursing & Social Welfare Sciences, Fukui Prefectural University, Fukui, Japan
2. Department of Pediatrics, Sapporo Medical University School of Medicine, Sapporo, Japan
3. Department of Pediatrics, Hakodate Municipal Hospital, Hakodate, Japan
4. Division of Pediatrics, Sapporo Medical University Hospital, Sapporo, Japan
5. Division of Pediatric Hematology/Oncology, Hokkaido Medical Center for Child Health and Rehabilitation, Sapporo, Japan
6. Department of Pediatrics, The University of Tokyo Hospital, Tokyo, Japan
7. Midorinosato, Saiseikai Otaru Hospital, Otaru, Japan