1. Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, Group for Functionalized Biomaterials, EPFL SB ISIC SCI-SB-SG, Station 6, Lausanne CH-1015, Switzerland
2. Department of Applied Physics, Université de Genève, 22 Chemin de Pinchat, Genève CH-1211, Switzerland
3. Department of Biomedical Sciences, Université de Lausanne, 7 Rue du Bugnon, Lausanne CH-1005, Switzerland
4. SYMME, Université Savoie Mont-Blanc, Annecy F-74000, France