1. Department of Pharmaceutical Sciences, Faculty of Pharmacy, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
2. Department of Pharmacognosy and Traditional Medicine, Faculty of Pharmaceutical Sciences, University of Jos, Jos, Nigeria
3. Section for Pharmaceutical Chemistry, Department of Pharmacy, University of Oslo, Oslo, Norway
4. Department of Chemistry, University of Oslo, Oslo, Norway
5. Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, P.R. China
6. Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, University of Jos, Jos, Nigeria