1. Department of Oral and Maxillofacial Surgery, University of Kiel, Kiel, Germany.
2. Faculty of Health Sciences and Medicine, Bond University, Gold Coast, Australia.
3. Clinic of Prosthodontics, Propaedeutics and Dental Materials, University of Kiel, Kiel, Germany.
4. Epsom and St. Helier University Hospital NHS Trust and South West London Elective Orthopaedic Centre, University of London, London, United Kingdom.