1. The Azrieli Faculty of Medicine, Bar-Ilan University, Safed, Israel.
2. Gastrointestinal Unit, Baruch Padeh Medical Center, Poriya Affiliated with the Faculty of Medicine, Bar-Ilan University, Galilee, Israel.
3. Pediatric Gastrointestinal Unit, Baruch Padeh Medical Center, Poriya Affiliated with the Faculty of Medicine, Bar-Ilan University, Galilee, Israel.
4. Clinical Microbiology Laboratory, Baruch Padeh Medical Center, Poriya, Israel.
5. Gastrointestinal Unit, Holy Family Hospital, Nazareth, Israel.