1. Department of Gastroenterology, Rabin Medical Center, Beilinson Hospital, 39 Jabotinski Street 49100, Petach Tikva, Israel
2. Department of Nuclear Medicine, Rabin Medical Center, Beilinson Hospital, Israel
3. Department of Biostatistics, Rabin Medical Center, Beilinson Hospital, Israel
4. Epidemiology Unit, Edith Wolfson Medical Center, Holon and the Sackler Faculty of Medicine, Tel Aviv University, Israel