1. Department of Physiology, Faculty of Medicine, Alneelain University, Khartoum, Sudan
2. Nephrology Unit, Military Hospital Omdurman, Sudan
3. Department of Pharmaceutics, College of Pharmacy, Karary University, Khartoum, Sudan
4. Department of Medicine, Medicine & Surgery College, Karary University, Khartoum, Sudan
5. Faculty of Pharmacy, University of Science & Technology, Omdurman, Sudan
6. Institute of Nephrology, Cardiff University School of Medicine, Cardiff, UK
7. Department of Physiology, Faculty of Medicine, University of Khartoum, Khartoum, Sudan