1. Federal Ministry of Health, Khartoum state, Sudan.
2. Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia.
3. Free lance community medicine consultant, Khartoum, Sudan.
4. Faculty of Medicine, Al Fashir University, Al Fashir, Sudan.
5. State Ministry of Health, North Darfur, Al Fashir, Sudan.
6. Federal Ministry of Health, Khartoum, Sudan