1. Center for International Forestry Research (CIFOR)-World Agroforestry (ICRAF), Nairobi, Kenya
2. Department of Social Sciences, Wageningen Universiteit Maatschappijwetenschappen, Wageningen, The Netherlands
3. Agrifood Chain Management, International Crops Research Institute for the Semi-Arid Tropics, Berlin, Germany
4. International Potato Center, Nairobi, Kenya