1. Institute for Bioengineering and Institute for Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Station 15, CH-1015 Lausanne, Switzerland
2. Department of Pharmaceutical Sciences, University G. d’Annunzio, 66013 Chieti Scalo, Italy
3. Laboratory for Ultrastructural Analysis, University of Lausanne, CH-1016 Lausanne, Switzerland