1. Institute of Prosthodontics and Implant Dentistry, Faculty of Medicine University of Coimbra Coimbra Portugal
2. Centre for Innovation and Research in Oral Sciences (CIROS), Faculty of Medicine University of Coimbra Coimbra Portugal
3. Centre for Mechanical Engineering, Materials and Processes (CEMMPRE) University of Coimbra Coimbra Portugal
4. Division of Fixed Prosthodontics and Biomaterials, University Clinics of Dental Medicine University of Geneva Geneva Switzerland
5. Faculty of Odontology University of Iceland Reykjavik Iceland