1. a International Institute of Tropical Agriculture (IITA) , Cotonou, 08 B.P. 0932, Benin
2. b Ministry of Food and Agriculture , Accra, P.O. Box M37, Ghana
3. c Université de l’Lomé , Lomé, B.P. 1515, Togo
4. d Ghana Standards Board , Accra, Ghana, P.O. Box MB 245, Benin
5. e Direction de l’Alimentation et de la Nutrition Appliquée, (DANA) , Porto-Novo, B.P. 295, Benin