1. Department of BioMedical Research, University of Bern, Bern, Switzerland;
2. Department of Pulmonary Medicine, University Hospital of Bern, Bern, Switzerland;
3. BioNanomaterials, Adolphe Merkle Institute, University of Fribourg, Fribourg, Switzerland;
4. Laboratory for Particles-Biology Interactions, Empa Swiss Federal Laboratories for Material Science and Technology, St. Gallen, Switzerland;
5. Institute of Anatomy, University of Bern, Bern, Switzerland