1. EMPA Swiss Federal Laboratories for Materials Science and Technology Cellulose & Wood Materials Laboratory Dübendorf 8600 Switzerland
2. École Polytechnique Fédérale de Lausanne (EPFL) Soft Transducers Laboratory (LMTS) Neuchâtel 2000 Switzerland
3. Department of Health Sciences and Technology ETH Zürich Schmelzbergstrasse 9 Zürich 8092 Switzerland