1. Division of Infectious Diseases, IRCCS Ospedale Policlinico San Martino , Genoa , Italy
2. Division of Infectious Diseases, Department of Health Sciences (DISSAL), University of Genoa , Via Pastore, 1, 16132 Genoa , Italy
3. Hygiene Unit, IRCCS Ospedale Policlinico San Martino , Genoa , Italy
4. Pharmacology Unit, IRCCS Ospedale Policlinico San Martino , Genoa , Italy