1. Metsähallitus Forestry Ltd , Ratatie 11, PO Box 94, Vantaa FI-01301 , Finland
2. School of Forest Sciences, University of Eastern Finland , Yliopistokatu 7, PO Box 111, Joensuu FI-80101 , Finland
3. Natural Resources Institute Finland (Luke), Bioeconomy and Environment Unit , Latokartanonkaari 9, Helsinki FI-00790 , Finland