1. Department of Agricultural Economics and Agribusiness Management, University of Egerton, P.O.BOX 536, Egerton, 20115, Kenya
2. World Vegetable Center, West and Central Africa, Coastal and Humid Regions, Cotonou, BP, 0932 Tri Postal, Benin
3. World Vegetable Center (WorldVeg), Eastern and Southern Africa, P.O. Box 10, Arusha, Duluti, Tanzania