1. Forest Ecology; Department of Environmental Systems Science; Institute of Terrestrial Ecosystems; ETH Zürich, CH-8092 Zürich, Switzerland
2. Instituto Pirenaico de Ecología (IPE, CSIC); Avda. Montañana 1005 50059 Zaragoza Spain
3. Department of Wood Science and Technology; Biotechnical Faculty; University of Ljubljana,SI-1000 Ljubljana, Slovenia
4. INRA; URFM; UR 629; Ecologie des Forêts Méditerranéennes; Domaine Saint Paul, Site Agroparc F-84914 Avignon Cedex 9 France
5. Department of Botany; Faculty of Science and Technology; University of Debrecen; PO Box 14 H-4010 Debrecen Hungary
6. Department of Forest Science; University of Helsinki; PO Box 27 Helsinki FI-00014 Finland
7. Natural Resources Institute Finland (Luke); Jokiniemenkuja 1 01301 Vantaa Finland
8. Laboratory of Plant Biology and Nature Management (APNA); Vrije Universiteit Brussel; B-1050 Brussels Belgium
9. Laboratory of Wood Biology and Xylarium; Royal Museum for Central Africa (RMCA); B-3080 Tervuren Belgium
10. INIBIOMA; CONICET-Universidad Nacional Comahue; Quintral 1250 Bariloche Argentina
11. Dipartimento di Bioscienze e Territorio; Università degli Studi del Molise; Contrada Fonte Lappone Pesche I-86090 Italy
12. CREAF; Cerdanyola del Vallès E-08193 Barcelona Spain
13. University Autònoma Barcelona; Cerdanyola del Vallès E-08193 Barcelona Spain