Clinic of Cranio-Maxillofacial and Oral Surgery, Center of Dental Medicine, University of Zurich, University Hospital Zurich, Plattenstrasse 11, 8032, Zürich, Switzerland

Silvio Valdec, Pavla Pasic, Bernd Stadlinger & Martin Rücker

Institute of Surgical Pathology, University Hospital Zurich, Zurich, Switzerland

Alex Soltermann

Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Center of Dental Medicine, University of Zurich, Zurich, Switzerland

Daniel Thoma

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Correspondence to Silvio Valdec.