| Affiliation: | aAssistant Professor, Department of Restorative and Preventive Dentistry, School of Dental and Oral Medicine, University of Hamburg, Hamburg, Germany;bAssociate Professor, Department of Operative Dentistry, Faculty of Dentistry, Hacettepe University of Ankara, Ankara, Turkey;cAssociate Professor, Department of Restorative and Preventive Dentistry, School of Dental and Oral Medicine, University of Hamburg, Hamburg, Germany;dProfessor, Department of Prosthetic Dentistry, School of Oral Medicine, University of Cologne, Cologne, Germany |
