1. Department of Family Medicine, Siaal Research Center for Family Medicine and Primary Care, Faculty of Health Sciences, Ben-Gurion University of the Negev, Be’er Sheva, Israel
2. Clalit Health Services, Southern District, Be’er Sheva, Israel
3. Clinical Virology Laboratory, Soroka University Medical Center, Faculty of Health Sciences, Ben-Gurion University of the Negev, Be’er Sheva, Israel
4. Department of Public Health and Multidisciplinary Center for Research on Aging, Ben-Gurion University of the Negev, Be’er Sheva, Israel
5. Department of Public Health, Ben-Gurion University of the Negev, Be’er Sheva, Israel