1. Department of Life Sciences, University of Siena, 53100 Siena, Italy
2. Post Graduate School of Public Health, University of Siena, 53100 Siena, Italy
3. Department of Molecular and Developmental Medicine, University of Siena, 53100 Siena, Italy
4. VisMederi S.r.l., 53100 Siena, Italy
5. Interuniversity Research Centre on Influenza and Other Transmissible Infections (CIRI-IT), 16132 Genoa, Italy