1. Departments of Virology,
2. Pediatrics, and
3. Hematology, Nagoya University Graduate School of Medicine, Nagoya, Japan;
4. Department of Otolaryngology, Head and Neck Surgery, Nagoya City University Graduate School of Medical Sciences and Medical School, Nagoya, Japan;
5. Division of Pediatric Oncology, Fukushima Medical University Cancer Center, Fukushima, Japan;
6. Department of Pediatrics, Osaka Medical Center and Research Institute for Maternal and Child Health, Osaka, Japan;
7. Department of Pathology, School of Medicine, Kurume University, Kurume, Japan; and
8. Department of Pathology and Laboratory Medicine, Nagoya University Hospital, Nagoya, Japan