1. Infectious Diseases Unit, Department of Internal Medicine, Ospedale Policlinico S. Martino, Genoa, Italy.
2. National Institute for Infectious Diseases, IRCCS L. Spallanzani, Rome, Italy.
3. Infectious Diseases Unit, Sacco Hospital, Department of Biomedical and Clinical Sciences ‘Luigi Sacco’, University of Milan, Milan, Italy.
4. Malattie Infettive Universitarie, ed Epatologia, Dipartimento di Medicina Interna e Specialistica, Azienda Ospedaliera Universitaria Senese, Siena, Italy.
5. Infectious Diseases Unit, Ospedale San Gerardo, Monza, Italy.
6. Infectious Diseases Unit, Policlinico di Bari, Bari, Italy.
7. University Department of Infectious and Tropical Diseases, University of Brescia and Brescia Spedali Civili General Hospital, Brescia, Italy.
8. Division of Infectious Diseases, San Paolo Hospital, University of Milan, Milan, Italy.