1. Thuenen Institute of Wood Research, Leuschnerstraße 91d, D-21031 Hamburg, Germany
2. Norwegian Institute of Bioeconomy Research (NIBIO), Høgskoleveien 8, NO-1433 Ås, Norway
3. Wood Biology and Wood Products, Faculty of Forest Sciences and Forest Ecology, University of Goettingen, Büsgenweg 4, D-37077 Goettingen, Germany
4. Department of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia
5. Heinz-Piest Institute for Skilled Crafts, Wilhelm-Busch-Straße 18, D-30167 Hanover, Germany