1. Department of Engineering Mechanics, KTH Royal Institute of Technology, Teknikringen 8, 100 44 Stockholm, Sweden
2. Treesearch, Teknikringen 38a, 100 44 Stockholm, Sweden
3. Wallenberg Wood Science Centre, Teknikringen 56-58, 100 44 Stockholm, Sweden
4. Aix Marseille Univ, CNRS, Centrale Marseille, IRPHE-Marseille, Marseille 13284 France
5. RISE, Drottning Kristinas väg 61, 114 28 Stockholm, Sweden