1. Department of Community Medicine, Faculty of Medicine Ibn Sina University Khartoum Sudan
2. Faculty of Health Sciences, School of Health Systems and Public Health University of Pretoria Pretoria South Africa
3. Department of Community Medicine, Faculty of Medicine Alneelain University Khartoum Sudan
4. BSc Clinical Pharmacy Khartoum Sudan
5. BSc Dentistry (BDS) Khartoum Sudan