1. Department of Allergy, Infectious Diseases and Immunology Gunma Children's Medical Center Shibukawa Gunma Japan
2. Gunma Prefectural Institute of Public Health and Environmental Sciences Maebashi Gunma Japan
3. Pathogen Genomics Center National Institute of Infectious Diseases Tokyo Japan
4. Department of Neonatology Gunma Children's Medical Center Shibukawa Gunma Japan