1. Faculty of Agriculture and Forestry, Department of Food and Nutrition, FI-00014 University of Helsinki, P.O. Box 66, Finland
2. Wallenberg Wood Science Center, Department of Fiber and Polymer Technology, Royal Institute of Technology, KTH, Teknikringen 56, 100 44, Stockholm, Sweden
3. Helsinki Institute of Sustainability Science (HELSUS), FI-00014 University of Helsinki, P.O. Box 65, Finland