1. University Clinic of Oral and Maxillofacial Surgery, Medical University of Innsbruck, Innsbruck, Austria
2. University Clinic of Oral and Maxillofacial Surgery, Otto von Guericke University of Magdeburg, Magdeburg, Germany
3. Department of Restorative and Prosthetic Dentistry, Medical University of Innsbruck, Innsbruck, Austria