1 Centre for Research on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies, Yaoundé, Cameroon.
2 Research Unit of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Sciences, University of Dschang, Dschang, Cameroon.
3 Department of Pharmacological and Biomolecular Sciences, Faculty of Pharmacy, University of Milan, Milan, Italy.
4 Research Institute in Healthcare Sciences, Department of Biology, Chemistry and Forensic Science, School of Sciences, Faculty of Science and Technology, University of Wolverhampton, Wolverhampton, United Kingdom.