1. Socio-economics and Biometrics/Directorate General, Rwanda Agricultural Board (RAB) , P.O. Box 5016 , Kigali , Rwanda
2. Division of Bioeconomics/Faculty of Bioscience Engineering, Catholic University of Leuven (K.U. Leuven) , 200e - box 2411 3001 , Leuven , Belgium
3. Agriculture & Agro-Industry Department/Agriculture African Development Bank Group , Avenue Jean-Paul II 01 BP 1387 , Abidjan 01 , Côte d’Ivoire
4. Research for Development/Central Africa and Natural Resource Management, International Institute of Tropical Agriculture (IITA) , c/o ICIPE P.O. Box 30772-00100 , Nairobi , Kenya