1. Department of Prosthetic Dentistry Faculty of Medicine Medical Center ‐ University of Freiburg, Center for Dental MedicineUniversity of Freiburg Freiburg Germany
2. Swerea IVF AB Mölndal Sweden
3. Medical Center ‐ University of FreiburgInstitute for Medical Biometry and StatisticsFaculty of MedicineUniversity of Freiburg Freiburg Germany