1. Chemistry Department, College of Natural and Applied Sciences, University of Dar es Salaam, P.O. Box 35061, Dar es Salaam, Tanzania
2. Department of Chemistry, College of Education, Mwalimu Julius K. Nyerere University of Agriculture and Technology, P.O. Box 976, Butiama, Tanzania
3. Institute of Traditional Medicine, Muhimbili University of Health and Allied Sciences, P.O. Box 65001, Dar es Salaam, Tanzania
4. Department of Infectious Diseases/Virology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, S-413 46 Gothenburg, Sweden
5. Department of Chemistry − Ångström, Uppsala University, SE-751 20 Uppsala, Sweden
6. University of Jyvaskyla, Department of Chemistry, 40014 Jyväskylä, Finland
7. Department of Chemistry − BMC, Uppsala University, SE-751 23 Uppsala, Sweden
8. Department of Chemistry, College of Science and Technology, University of Rwanda, P.O Box 3900, Kigali, Rwanda