1. Department of Pharmaceutical Microbiology, Faculty of Pharmacy, International University of Africa, Khartoum P.O. Box 2469, Sudan
2. Department of Pharmacy Practice and Clinical Pharmacy, Faculty of Pharmacy, International University of Africa, Khartoum P.O. Box 2469, Sudan
3. Department of Pharmacology, Faculty of Pharmacy, University of Khartoum, Khartoum P.O. Box 1996, Sudan
4. Department of Pharmaceutical Microbiology, Pharmacy Program, Al-Yarmouk College, Khartoum P.O. Box 11111, Sudan
5. Department of Pharmacognosy, Faculty of Pharmacy, University of Khartoum, Khartoum P.O. Box 1996, Sudan
6. Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
7. Department of Biology, College of Science and Technology, Florida A & M University, Tallahassee, FL 32307, USA