1. Division of Infectious Diseases, Department of Internal Medicine, San Gerardo Hospital, University of Milano-Bicocca, Monza, Italy
2. Department of Internal Medicine, Clinic of Infectious Diseases, San Paolo Hospital, University of Milan, Milan, Italy
3. 1st Division of Infectious Diseases, Luigi Sacco Hospital, Milan, Italy
4. Clinic of Infectious Diseases, University of Brescia, Brescia, Italy
5. Infectious Diseases Unit, Busto Arsizio Hospital, Busto Arsizio, Italy
6. Numico Research BV, Wageningen, The Netherlands
7. Department of Clinical Science, Luigi Sacco Hospital, University of Milan, Milan, Italy
8. Department of Medical Microbiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
9. Department of Science Technology Biomedicine, University of Milan, Milan, Italy