1. Laboratory for Cellulose and Wood Materials, Empa, Überlandstrasse 129, 8600 Dübendorf, Switzerland
2. Institute of Food Nutrition and Health, ETH Zürich, Schmelzbergstrasse 7, 8092 Zürich, Switzerland
3. Scientific Centre for Optical and Electron Microscopy, ETH Zurich, 8093, Zurich, Switzerland