1. Department of Translational Research, University of Pisa, 56127 Pisa, Italy
2. Department of Paediatrics, Japan Community Health Care Organisation Osaka Hospital, Osaka 5530003, Japan
3. Department of Paediatrics, Fukuoka Tokushukai Hospital, Fukuoka 8160864, Japan
4. Department of Biological Sciences, University of Tokyo, Tokyo 1130033, Japan
5. Laboratory of Virology, National Institute for Infectious Diseases “Lazzaro Spallanzani”—IRCCS, 00149 Rome, Italy