1. Unit of Infectious Diseases, Rabin Medical Center, Beilinson Hospital, Petah-Tikva, Israel
2. Sackler Faculty of Medicine, Tel Aviv University, Ramat-Aviv, Israel
3. Department of Acute Geriatrics, Rabin Medical Center, Beilinson Hospital, Petah-Tikva, Israel
4. Department of Medicine E, Rabin Medical Center, Beilinson Hospital, Petah-Tikva, Israel
5. Unit of Infectious Diseases, Rambam Hospital, Haifa, Israel