affiliation not provided to SSRN, National Institute of Infectious Diseases, affiliation not provided to SSRN, Okinawa Prefectural Nanbu Medical enter & Children’s Medical Center - Department of Pediatric Infectious Diseases, Toyama Institute of Health - Department of Research Planning, affiliation not provided to SSRN, Kochi University, Okayama University, Niigata University, Fukushima Regional Center for the Japan Environmental and Children’s Study, Hokkaido University, Chiba University - Chiba University Hospital, Chiba University - Chiba University Hospital and Mie National Hospital