1. Department of Pediatric Oncology, Institute of Development, Aging and Cancer, Tohoku University
2. Department of Pediatrics, Fukushima Medical College
3. Department of Pediatrics, Yamagata University School of Medicine
4. Department of Pediatrics, Iwate Medical College
5. Department of Pediatrics, Hirosaki University School of Medicine
6. Department of Pediatrics, Akita University School of Medicine
7. Department of Pediatrics, Tohoku University School of Medicine