1. Virology Unit, Department of Medical Biotechnologies University of Siena Siena Tuscany Italy
2. Microbiology and Virology Unit Santa Maria alle Scotte University Hospital Siena Tuscany Italy
3. Preventive Medicine and Health Surveillance Unit Santa Maria alle Scotte University Hospital Siena Tuscany Italy
4. Anesthesia and Intensive Care Unit, Department of Medicine, Surgery and Neuroscience University of Siena Siena Tuscany Italy