Tohoku University, affiliation not provided to SSRN, National Defense Medical College, National Institute of Infectious Diseases, Tohoku University, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Tokyo Metropolitan Institute of Public Health - Department of Microbiology, affiliation not provided to SSRN, Nippon Medical School, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, National Institute of Infectious Diseases - Infectious Disease Surveillance Center, National Center for Child Health and Development, Australian National University (ANU) - National Centre for Epidemiology and Population Health, affiliation not provided to SSRN, National Institute of Infectious Diseases - Infectious Disease Surveillance Center, Kaedenokaze Home Care Clinic Yamato, affiliation not provided to SSRN, affiliation not provided to SSRN, National Institute of Infectious Diseases - Field Epidemiology Training Center and Tohoku University

affiliation not provided to SSRN, affiliation not provided to SSRN, Tokyo Metropolitan Institute of Public Health - Department of Microbiology, Tokyo Metropolitan Institute of Public Health and affiliation not provided to SSRN