1. International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Chitedze Agricultural Research Station, Lilongwe P.O. Box 1096, Malawi
2. Department of Nutritional Sciences, College of Human Sciences, Texas Tech University, P.O. Box 41270, Lubbock, TX 79409-1270, USA
3. School of Life Science and Bio-Engineering, The Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania
4. Department of Biosciences, Sokoine University of Agriculture (SUA), Morogoro P.O. Box 3038, Tanzania
5. Tanzania Agricultural Research Institute (TARI, Naliendele), Mtwara P.O. Box 509, Tanzania