1. Ministry of Health, Gertner Institute, Chaim Sheba Medical Center, Ramat-Gan, Israel
2. Central Virology Laboratory, Public Health Services, Ministry of Health, Chaim Sheba Medical Center, Ramat-Gan, Israel
3. Blood Services, Magen David Adom, Ramat-Gan, Israel
4. Soroka University Medical Center, Clalit Health Services, Beer Sheva, Israel
5. Haifa and Western Galilee Laboratories, Clalit Health Services, Nesher, Israel
6. Schneider Children Medical Center, Clalit Health Services, Petah-Tiqwa, Israel
7. Blood Services, Mayanei Hayeshua Medical Center, Bnei-Brak, Israel
8. Department of Epidemiology and Preventive Medicine, School of Public Health, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel