1. Children’s Medical Center, Northern Yokohama Hospital, Showa University, Yokohama, Japan;
2. Department of Pediatrics, Shinshu University School of Medicine, Matsumoto, Japan;
3. Department of Infection and Host Defense, Graduate School of Medicine, Shinshu University, Matsumoto, Japan;
4. Department of Immunology and Rheumatology, Division of Advanced Preventive Medical Sciences, Nagasaki University, Nagasaki, Japan