[1] Graz Univ, Dept Internal Med, Div Infect Dis, A-8036 Graz, Austria
[2] Graz Univ, Dept Internal Med, Div Nucl Med, A-8036 Graz, Austria
[3] Graz Univ, Div Hosp Hyg, Clin Inst Hyg & Med Microbiol, A-8036 Graz, Austria
[4] Univ Rostock, Dept Internal Med, Div Infect Dis & Trop Med, D-2500 Rostock, Germany