1. Unit of Infectious Diseases, Ospedale Santa Chiara , via Largo Medaglie d'oro 9 ,CAP 38122, Trento , Italy
2. Unit of Microbiology, Ospedale Santa Chiara , via Largo Medaglie d'oro 9,CAP 38122, Trento , Italy
3. Faculty of Medicine, University of Puthisastra , Phnom Penh , Cambodia