Institution: | 1. Department of Prosthodontics, School of Dental Medicine, University of Bern, , Bern, Switzerland;2. Department of Preventive and Restorative Sciences, School of Dental Medicine, Robert Schattner Center, University of Pennsylvania, , Philadelphia, PA, USA;3. PENN Regional Nanotechnology Facility, School of Engineering and Applied Science, University of Pennsylvania, , Philadelphia, PA, USA;4. Ioffe Institute, St. Petersburg,Russian Federation |