Affiliation: | 1. Department of Pediatrics, Juntendo University Faculty of Medicine, Bunkyo-ku, Tokyo, Japan Division of Pediatrics, Tokyo Metropolitan Toshima Hospital, Itabashi-ku, Tokyo, Japan Contribution: Formal analysis, Investigation, Project administration, Resources, Writing - original draft;2. Department of Pediatrics, Juntendo University Faculty of Medicine, Bunkyo-ku, Tokyo, Japan;3. Division of Obstetrics and Gynecology, Tokyo Metropolitan Toshima Hospital, Itabashi-ku, Tokyo, Japan Contribution: Data curation, Resources, Validation, Writing - review & editing;4. Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Shinjuku-ku, Tokyo, Japan Contribution: Formal analysis, Investigation, Software, Validation, Visualization, Writing - review & editing;5. Department of Pediatrics, Juntendo University Faculty of Medicine, Bunkyo-ku, Tokyo, Japan Division of Pediatrics, Tokyo Metropolitan Toshima Hospital, Itabashi-ku, Tokyo, Japan Contribution: Resources, Writing - review & editing;6. Division of Obstetrics and Gynecology, Tokyo Metropolitan Toshima Hospital, Itabashi-ku, Tokyo, Japan Contribution: Resources, Supervision, Validation, Writing - review & editing;7. Department of Pediatrics, Juntendo University Faculty of Medicine, Bunkyo-ku, Tokyo, Japan Contribution: Project administration, Supervision, Writing - review & editing |