1. Food and Nutrition Sciences Laboratory,International Institute of Tropical Agriculture (IITA), Southern Africa Hub, PO Box 310142, Chelston, Lusaka, Zambia
2. Plant Breeding Unit, International Institute of Tropical Agriculture (IITA), Southern Africa Hub, Chitedze Research Station, Lilongwe, Malawi
3. Food and Nutrition Sciences Laboratory, International Institute of Tropical Agriculture (IITA), Ibadan, Oyo, Nigeria