1. Unit of Infectious Diseases, Department of Medical Area, “Santa Chiara” Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy.
2. Unit of Infectious Diseases, Specialist Department, “Santa Maria della Misericordia” Hospital, Rovigo, Italy.
3. Unit of Infectious Diseases, Department of medical Area, “San Bortolo” Hospital, Vicenza, Italy.
4. Faculty of Medicine, University of Puthisastra, Phnom Penh, Cambodia.