1. Department of Medical Sciences, Infectious Diseases, University of Turin, 10139 Turin, Italy
2. School of Medicine, Tufts University, Boston, MA 02111, USA
3. Internal Medicine Unit, Department of Medical Sciences, University Hospital Città della Salute e della Scienza di Torino, 10139 Turin, Italy
4. Microbiology and Virology Unit, Department of Paediatrics and Public Health, University Hospital Città della Salute e della Scienza di Torino, 10139 Turin, Italy
5. Laboratory of Clinical Pharmacology and Pharmacogenetics, Department of Medical Sciences, Amedeo di Savoia Hospital, University of Turin, 10149 Turin, Italy