1. These authors contributed equally to this study
2. Braun School of Public Health and Community Medicine, Hebrew University Hadassah Faculty of Medicine, Jerusalem, Israel
3. Public Health Services, Ministry of Health, Jerusalem, Israel
4. The Division of Epidemiology, Public Health Services, Ministry of Health, Jerusalem, Israel
5. Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel
6. Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv, Israel
7. Central Virology Laboratory, Public Health Services, Ministry of Health, The Chaim Sheba Medical Centre, Tel Hashomer, Israel
8. South District Health Office, Ministry of Health, Beer Sheva, Israel
9. Ministry of Health, Jerusalem, Israel