1. Department of Conservative Dentistry and Periodontology; University Hospital; Regensburg Germany
2. Department of Conservative Dentistry and Periodontology; University of Würzburg; Würzburg Germany
3. Department of Oral Biology and Endodontics; University of Paris Diderot (Paris 7); Paris France
4. Department of Oral Health Sciences, KU Leuven and Dentistry; University Hospitals Leuven; Leuven Belgium
5. Private Practice; Augsburg Germany