1 Department of Pediatrics, Fujita Health University School of Medicine, 1-98, Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan. Electronic address: tetsushi@fujita-hu.ac.jp.
2 Department of Pediatrics, National Mie Hospital, Tsu, Mie, Japan.
3 Suzuka Pediatrics, Suzuka, Mie, Japan.
4 Department of Pediatrics, Konan Kosei Hospital, Konan, Aichi, Japan.
5 The Chemo-Sero-Therapeutic Research Institute, Kumamoto, Kumamoto, Japan.