1. Faculty of Medicine, Alexandria University, Alexandria, Egypt
2. Medical Research Group of Egypt (MRGE), Cairo, Egypt
3. Faculty of Medicine, Ain shams University, Cairo, Egypt
4. Faculty of Medicine, Helwan University, Cairo, Egypt
5. Faculty of Medicine, Zagazig University, Ash Sharqia, Egypt
6. Faculty of Medicine, Suez University, Suez, Egypt
7. Faculty of Medicine, Al-Azhar University, Cairo, Egypt