[1] Forestry Commiss Ghana, Kumasi 00233, Ghana
[2] Univ Copenhagen, Dept Food & Resource Econ, DK-1958 Frederiksberg, Denmark
[3] Aarhus Univ, Dept Agroecol Agr Syst & Sustainabil, Blichers Alle 20, DK-8830 Tjele, Denmark
[4] Kwame Nkrumah Univ Sci & Technol, Dept Agroforestry, Kumasi 00233, Ghana
[5] Cocoa Res Inst, Tafo 00233, Ghana