1. Division of Hematology and Bone‐Marrow Transplantation Sheba Medical Center Tel‐HashomerIsrael
2. Sackler Faculty of Medicine Tel‐Aviv University Tel AvivIsrael
3. The Infectious Diseases Unit Sheba Medical Center Tel‐HashomerIsrael
4. Bio‐statistical and Bio‐mathematical Unit The Gertner Institute of Epidemiology and Health Policy Research Sheba Medical Center Tel‐HashomerIsrael
5. Central Virology Laboratory Ministry of Health and Sheba Medical Center Tel‐Hashomer Israel