Zayed, N., Morad, M., Elsayed, E., Ezzat, W. and Labib, S. 2014. Tissue Expression of Glutathione S- Transferase P1 and Matrix Metalloproteinase-9 Tissue in Egyptian Patients with Barrett Esophagus and Esophageal Adeno-carcinoma. International Journal of Sciences: Basic and Applied Research (IJSBAR). 14, 2 (Nov. 2014), 353–365.