[1] CIRAD, Int Ctr Trop Agr, Decis & Policy Anal Res Area, UMR Innovat, Km 17 Recta Cali Palmira,Apartado Aereo 6713, Cali, Colombia
[2] CIRAD, UMR Innovat, F-34398 Montpellier, France
[3] Univ Montpellier, F-34090 Montpellier, France
[4] Int Ctr Trop Agr, Decis & Policy Anal Res Area, Molina Apartado Postal 1558, Lima, Peru
[5] Int Ctr Trop Agr, Decis & Policy Anal Res Area, Km 17 Recta Cali Palmira,Apartado Aereo 6713, Cali, Colombia
[6] Oxfam Novib, Postbus 30919, NL-2500 GX The Hague, Netherlands