1. University of Tor Vergata, Rome, Italy.
2. INMI, Lazzaro Spallanzani, Rome, Italy.
3. IRCCS, San Raffaele, Milan, Italy.
4. University of Modena, Modena, Italy.
5. University of Brescia, Brescia, Italy.
6. University of Turin, Turin, Italy.
7. IRCCS, San Matteo, Pavia, Italy.
8. Institute of Infectious and Tropical Diseases, L. Sacco Hospital, Milan, Italy.
9. Clinic of Infectious diseases, Hospital Amedeo di Savoia, Turin, Italy.