1. Department of Pediatrics Shinshu University School of Medicine Matsumoto Japan
2. Department of Pediatrics Kofu Municipal Hospital Kofu Japan
3. Department of Pediatrics Azumino Red Cross Hospital Azumino Japan
4. Children's Medical Center, Northern Yokohama Hospital Showa University Yokohama Japan
5. Department of Infection and Host Defense, Graduate School of Medicine Shinshu University Matsumoto Japan
6. Department of Pathology, Proteo‐Science Center and Graduate School of Medicine Ehime University Toon Japan
7. Department of Pediatrics Dokkyo Medical University Shimotsuga Japan
8. Department of Rheumatology Fukushima Medical University School of Medicine Fukushima Japan
9. Department of Community Health and Preventive Medicine Hamamatsu University School of Medicine Hamamatsu Japan