1. Medical Center - University of Freiburg, Center for Dental Medicine, Department of Prosthetic Dentistry, Faculty of Medicine, University of Freiburg, Germany
2. Swerea IVF AB, Sweden
3. Medical Center - University of Freiburg, Center for Medical Biometry and Medical Informatics, Institute for Medical Biometry and Statistics, Facult, Germany
4. Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin CBF, CC 3 Dental and Craniofacial Sciences, Department of Prosthodontics, Geriatri, Germany