1. Epidemiology Unit, Department of Infectious Diseases, National Health Institute, Rome, Italy.
2. Infectious Diseases Department, Amedeo di Savoia Hospital and University of Turin, Turin, Italy.
3. Department of Infectious and Tropical Diseases, “La Sapienza” University, Rome, Italy.
4. Division of Infectious Diseases, “L. Sacco” Hospital, Milan, Italy.
5. Department of Infectious Diseases, Foggia University, Foggia, Italy.
6. General Hospital, Bari University, Bari, Italy.
7. Ambulatorio di Medicina dei Viaggi, del Turismo e delle Migrazioni, Palermo University, Palermo, Italy.