1. Department of Pediatrics; National Hospital Organization Nagoya Medical Center; Nagoya Aichi Japan
2. Department of Clinical Research Center; National Hospital Organization Nagoya Medical Center; Nagoya Aichi Japan
3. Department of Pediatrics; Kyoto Prefectural University of Medicine; Kyoto City Kyoto Japan
4. Department of Palliative Medicine; Yodogawa Christian Hospital; Osaka City Osaka Japan
5. Department of Hematology/Oncology; Miyagi Children's Hospital; Sendai Miyagi Japan