1. National Center for Natural Products Research, School of Pharmacy, University of Mississippi, University, MS, USA
2. Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
3. SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Pretoria, South Africa
4. Division of Pharmacognosy, Department of BioMolecular Sciences, School of Pharmacy, University of Mississippi, University, MS, USA