1. Natural Resources Institute Finland (Luke) , Yliopistokatu 6 B, Joensuu 80100, Finland
2. School of Forest Sciences, University of Eastern Finland , Yliopistokatu 7, 80100 Joensuu, Finland
3. Natural Resources Institute Finland (Luke) , Latokartanonkaari 9, 00790 Helsinki, Finland
4. Department of Environmental and Biological Sciences, University of Eastern Finland , Yliopistonranta 1 E, 70210 Kuopio, Finland
5. Natural Resources Institute Finland (Luke) , Juntintie 154, 77600 Suonenjoki, Finland
6. Natural Resources Institute Finland (Luke) , Ounasjoentie 6, 96200 Rovaniemi, Finland