1. Israel Center for Disease Control, Ministry of Health, Chaim Sheba Medical Center, Tel-Hashomer, Ramat-Gan, Israel.
2. Sackler Faculty of Medicine, School of Public Health, Tel Aviv University, Tel Aviv, Israel.
3. Central Campylobacter Laboratory, Public Health Services, Ministry of Health, Jerusalem, Israel.
4. Soroka University Medical Center and the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel.
5. Hadassah Medical Centers, Jerusalem, Israel.
6. Chaim Sheba Medical Center, Ramat Gan, Israel.
7. Haemek Medical Center, Afula, Israel.
8. Central Laboratory, Maccabi Health Services, Rehovot, Israel.
9. Central Laboratory, Clalit Health Services, Haifa, Israel.
10. Central Laboratory, Meuhedet Health Services, Lod, Israel.
11. Central Laboratory, Clalit Health Services, Tel-Aviv, Israel.