1. School of Pharmacy, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
2. Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown 2193, South Africa
3. Universidade de Lisboa, Faculdade de Ciências de Lisboa, DBV, Centro de Biotecnologia Vegetal, C2, Campo Grande, 1749-016 Lisboa, Portugal