Affiliation: | University Medical Center Ljubljana, Ljubljana, Slovenia (M. Jereb, B. Pecaver, J. Tomazic, I. Muzlovic, T. Premru-Srsen);;Institute of Microbiology and Immunology, Ljubljana (T. Avsic-Zupanc);;and Blood Transfusion Center of Slovenia, Ljubljana (S. Levicnik-Stezinar) |