1. Department of Epidemiology, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel.
2. Microbiology Laboratory, Rabin Medical Center, Beilinson Hospital, Petah Tikva, Israel.
3. Microbiology Laboratory, Hillel-Yaffe Medical Center, Hadera, Israel.
4. Microbiology Laboratory, Rambam Medical Center, Haifa, Israel.
5. Microbiology Laboratory, Tel-Aviv Sourasky Medical Center, Tel-Aviv, Israel.