1. Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag Durban X54001, South Africa
2. Department of Pharmaceutics and Pharmacy Practice, School of Pharmacy and Health Sciences, United States International University-Africa, P.O. Box 14634-00800, Nairobi 00800, Kenya
3. Department of Pharmaceutics, Faculty of Pharmacy, University of Khartoum, Khartoum 11111, Sudan
4. Department of Chemistry, Kenyatta University, P.O. Box 43844, Nairobi 00100, Kenya
5. Discipline of Human Physiology, School of Laboratory Medicine and Medical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban 4300, South Africa