1. Gastroenterology Laboratories, Gastroenterology Surgical Center, Mansoura University, Mansoura 35516, Egypt
2. Molecular Biology Department, Genetic Engineering and Biotechnology Research Institute, Sadat University, Sadat City, Egypt
3. Biochemistry Department, Faculty of Medicine, Umm Al-Qura University, Makkah, Saudi Arabia
4. Pathology Department, Faculty of Medicine, Mansoura University, Mansoura 35516, Egypt