1. Department of Periodontology Institute of Odontology Sahlgrenska Academy at University of Gothenburg Gothenburg Sweden
2. Department of Industrial Engineering University of Trento Trento Italy
3. Healthcare Research and Innovation Program (IRCS) Bruno Kessler Foundation Trento Italy
4. Section of Electron Microscopy Azienda Provinciale per i Servizi Sanitari di Trento Trento Italy