1 Department of General Pediatrics, Tokyo Metropolitan Children's Medical Center, 2-8-29, Musashidai, Fuchu-shi, Tokyo, Japan. yukari.tsushima@gmail.com.
2 Department of General Pediatrics, Tokyo Metropolitan Children's Medical Center, 2-8-29, Musashidai, Fuchu-shi, Tokyo, Japan.
3 Department of Hematology and Oncology, Tokyo Metropolitan Children's Medical Center, 2-8-29, Musashidai, Fuchu-shi, Tokyo, Japan.