1. a Faculty of Medicine, Mbarara University of Science and Technology, Mbarara city, Uganda
2. b DVGW-Technologiezentrum Wasser, Karlsruher Straße 84, 76139 Karlsruhe, Germany
3. c Faculty of Science, Mbarara University of Science and Technology, Mbarara city, Uganda
4. d Faculty of Science, Muni University, Mbarara city, Uganda