1. Department of Biological Sciences, Faculty of Science; Bindura University of Science Education; P. Bag 1020 Bindura Zimbabwe
2. Institute Ceres/Zavod Ceres; Lahovna 16 3000 Celje Slovenia
3. Department of Plastic and Reconstructive Surgery; University Medical Centre Maribor; Ljubljanska 5, 2000 Maribor Slovenia
4. Department of Chemistry and Biochemistry; University of Namibia; P/Bag 13301, 340 Mandume Ndemufayo Avenue Pionierspark Windhoek Namibia