1. Department of Gastroenterology, An-Najah National University Hospital, Nablus, Palestine
2. Department of Internal Medicine, An-Najah National University Hospital, Nablus, Palestine
3. Department of Medicine, An-Najah National University, Nablus, Palestine
4. Department of Neurology, An-Najah National University Hospital, Nablus, Palestine
5. Department of Surgery, An-Najah National University Hospital, Nablus, Palestine