1. Internal Medicine F and the Rheumatology Unit, The Chaim Sheba Medical Center, Ramat-Gan, Israel
2. Infectious Disease Unit/Microbiology Laboratory, The Chaim Sheba Medical Center, Ramat-Gan, Israel
3. Internal Medicine D, The Chaim Sheba Medical Center, Ramat-Gan, Israel
4. Department of Epidemiology and Preventive Medicine, Tel Aviv University affiliated to Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel.