Affiliation: | 1. Tsuchiya Children's Hospital, , Kuki, Saitama, Japan;2. HLH/LCH Committees in the Japanese Society of Pediatric Hematology, , Tokyo, Japan;3. Department of Preventive Medicine and Public Health, National Defense Medical College, , Tokorozawa, Saitama, Japan;4. Research/Education Committees in the Japanese Society of Pediatric Infectious Diseases, , Tokyo, Japan |