1. Institute for Infectious and Tropical Diseases, University of Brescia, Brescia, Italy.
2. University of Bari, Bari, Italy.
3. L. Sacco Hospital, Milan, Italy.
4. Department of Clinical Pharmacology, IRCCS Policlinico S. Matteo, Pavia, Italy.
5. S.M. Annunziata Hospital, ASL Florence, Florence, Italy.
6. Catholic University of Sacred Hearth, Rome, Italy.
7. Department of Infectious Diseases, Spedali Civili of Brescia, Brescia, Italy.
8. Institute of Microbiology, University of Brescia, Brescia, Italy.