1. Pharmacology Division, Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
2. Department of Pharmacology and Therapeutics, College of Health Sciences, Federal University, Birnin Kebbi, Nigeria
3. Centre for Health Science Education, Faculty of Health Science, University of the Witwatersrand, Johannesburg, South Africa
4. Health Economics and Epidemiology Research Office, Department Internal Medicine, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa