1. Research Centre for Natural and Environmental Sciences, University of Burundi, Bujumbura P.O. Box 2700, Burundi
2. Gembloux Agro-Bio Tech, University of Liège, Passage des Déportés 2, 5030 Gembloux, Belgium
3. Ecology, Ecological Restoration and Landscape Research Unit, Faculty of Agricultural Sciences, University of Lubumbashi, Lubumbashi P.O. Box 1825, Congo
4. Regional Post-Graduate Training School on Integrated Management of Tropical Forests and Lands (ERAIFT), Kinshasa P.O. Box 15373, Congo
5. Faculty of Architecture, University of Lubumbashi, Lubumbashi P.O. Box 1825, Congo
6. Burundian Office for Environmental Protection, Bujumbura P.O. Box 2757, Burundi