1. Department of Prosthodontics, University Hospital Würzburg, Pleicherwall 2, 97070 Würzburg, Germany
2. Faculty I, Nursing Science, Department of Behavioural Medicine and Principles of Human Biology for the Health Sciences, Trier University, Universitätsring 15, 54296 Trier, Germany
3. Department of Oral and Maxillofacial Plastic Surgery, University Hospital Würzburg, Pleicherwall 2, 97070 Würzburg, Germany