1. Department of General Pediatrics Tokyo Metropolitan Children's Medical Center Fuchu Tokyo Japan
2. Division of Infectious Diseases Department of Pediatrics Tokyo Metropolitan Children's Medical Center FuchuTokyoJapan
3. Infectious Disease Surveillance Center National Institute of Infectious Diseases ShinjukuTokyoJapan
4. Clinical Research Support Center Tokyo Metropolitan Children's Medical CenterFuchuTokyoJapan
5. Department of Radiology Tokyo Metropolitan Children's Medical Center FuchuTokyoJapan
6. Department of Virology II National Institute of Infectious Diseases Musashi‐Murayama Tokyo Japan
7. Department of Microbiology Tokyo Metropolitan Institute of Public Health Shinjuku Tokyo Japan
8. Division of Medical Science Department of Virology Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University Bunkyo Tokyo Japan