1. VTT Technical Research Centre of Finland, Post Office Box 1000, 02044 VTT, Finland.
2. University of New England, Armidale, NSW 2351, Australia.
3. Joanneum Research, Elisabethstrasse 5, A-8010 Graz, Austria.
4. Mid Sweden University, S-831 25 Östersund, Sweden.
5. Johann Heinrich von Thünen-Institute (vTI) German Federal Research Institute for Rural Areas, Forestry and Fisheries, Leuschnerstrasse 91, 21029 Hamburg, Germany.