1. University Medical Centre Ljubljana, Clinic For Infectious Diseases And Febrile Illneses , Japljeva 2, 1000 Ljubljana , Slovenia
2. University of Ljubljana, Faculty of Medicine , Vrazov trg 2, 1000 Ljubljana , Slovenia
3. University of Ljubljana, Faculty of Medicine, Institute of Microbiology and Immunology , Zaloška 4, 1000 Ljubljana , Slovenia