1. Department of Orthopaedic and Trauma Surgery; University Campus Bio-Medico of Rome; Via Alvaro del Portillo 200 00128 Rome Italy
2. Unit of Clinical Laboratory Science; University Campus Bio-Medico of Rome; Via Alvaro del Portillo 200 00128 Rome Italy
3. Infection control Committee; University Campus Bio-Medico of Rome; Via Alvaro del Portillo 200 00128 Rome Italy
4. Internal Medicine Department; University Campus Bio-Medico of Rome; Italy