1. Ecole de Sociologie Rurale et de Vulgarisation Agricole, Université Nationale d’Agriculture, Porto-Novo, Bénin
2. Access Agriculture, Brussels, Belgium
3. Agro-Insight, Cochabamba, Bolivia
4. Department of Agricultural Economics, Agribusiness and Extension, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana