1. Department of Chemistry, University of Nairobi, P.O. Box 30197, 00100 Nairobi, Kenya
2. Department of Chemistry − BMC, Uppsala University, SE-751 23 Uppsala, Sweden
3. Department of Chemistry, University of Antwerp, 2020 Antwerp, Belgium
4. Department of Chemistry, Salale University, P.O. Box 245, QPVQ+6C7, Fitche, Ethiopia
5. Department of Infectious Diseases/Virology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, S-413 46 Gothenburg, Sweden
6. Walter Reed Army Institute of Research - Africa (WRAIR-A), Kenya Medical Research Institute (KEMRI), P.O. Box 54, 40100 Kisumu, Kenya