1. Department of Operative Dentistry and Periodontology Faculty of Medicine University of Freiburg Freiburg Germany
2. Private Dental Practice Heil & Mayer Lauchringen Germany
3. Private Dental Practice Dres. Norbert Struß und Susanne Obrecht‐Struß Freiburg Germany
4. Department of Medical Psychology Faculty of Medicine University of Freiburg Freiburg Germany
5. Department of Medical Biometry and Medical Informatics Faculty of Medicine University of Freiburg Freiburg Germany