1. Viral Pathogenesis Unit Department of Public Health and Pediatric Sciences Medical School of Turin Via Santena 9 10126 Turin Italy
2. Virology Unit Department of Translational Medicine Medical School of Novara Italy
3. Division of Virology Department of Pathology University of Cambridge Cambridge U.K
4. Department of Sciences and Technological Innovation University of Piemonte Orientale Alessandria Italy
5. Department of Biomedical and Clinical Sciences University of Milan Milan Italy
6. University Division of Infectious and Tropical Diseases University of Brescia Brescia Italy