1. University of Rome Tor Vergata; Rome Italy
2. University College London; London UK
3. INMI L Spallanzani Hospital; Rome Italy
4. MRC Clinical Trials Unit; London UK
5. IRCSS San Gallicano; Rome Italy
6. Ospedali Riuniti; Bergamo Italy
7. Clinic of Infectious Diseases; Perugia Italy
8. Cremona Hospital; Cremona Italy
9. University of Siena; Siena Italy
10. Modena University Hospital; Modena Italy