1. Department of Health Sciences and Technology, ETH Zurich, 8092 Zurich, Switzerland
2. Laboratory for Cellulose & Wood Materials, Empa-Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
3. Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
4. Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland
5. Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH-8092 Zürich, Switzerland
6. Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
7. Department of Materials, ETH Zurich, 8093 Zurich, Switzerland