1. Department of Specialistic Area, Unit of Infectious Diseases, S. Maria della Misericordia Hospital, Rovigo, Italy.
2. Unit of Internal Medicine, S. Maria del Carmine Hospital, Rovereto, Italy.
3. Infectious Diseases Unit, G.B. Rossi University Hospital, Verona, Italy.
4. Unit of Infectious Diseases, S. Bortolo Hospital, Vicenza, Italy.
5. Faculty of Medicine, University of Puthisastra, Phnom Penh, Cambodia.