1. KTH Royal Institute of Technology, School of Chemical Science and Engineering Department of Fibre and Polymer Technology 100 44 Stockholm Sweden
2. Swedish Medical Nanoscience Center Department of Neuroscience, Karolinska Institutet 171 77 Stockholm Sweden
3. Applied Surface Chemistry Department of Chemical and Biological Engineering, Chalmers University of Technology 412 96 Gothenburg Sweden
4. Division of Medical Imaging and Technology, Department of Clinical Science Intervention and Technology (CLINTEC), Karolinska Institutet 171 77 Stockholm Sweden