1. School of Public Health and Community Medicine, The Sahlgrenska Academy, University of Gothenburg, PO Box 463, Göteborg SE 405 30, Sweden
2. Department of Agricultural Economics and Agribusiness, University of Buea, P. O. Box. 63, Buea, South West Region, Cameroon
3. Department of Economics Education, Nasarawa State University (NSUK), P.m.b. 1022, Keffi, Nasarawa State, Nigeria
4. Department of Crop Production and Technology (COLTEC), The University of Bamenda, Bambili, North West Region, Cameroon
5. Department of Public Law, Faculty of Law and Political Science, The University of Bamenda, Bambili, North West Region, Cameroon