1. Biochemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
2. Faculty of Medicine, Tripoli University, Tripoli, Libya
3. Faculty of Medicine, Misr University, Cairo, Egypt
4. Faculty of Medicine of Tunis, University of Tunis El Manar, Tunis, Tunisia
5. Kabir Medical College, Gandhara University, Peshawar, Pakistan
6. Community Medicine Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
7. Zagazig University Hospitals, Zagazig University, El-Sharkia, Egypt