1. Department of Conservative Dentistry and Periodontology University Hospital Regensburg Regensburg Germany
2. University Library University of Regensburg Regensburg Germany
3. Department of Oral Health Sciences, BIOMAT – Biomaterials Research Group, KU Leuven and Dentistry University Hospitals Leuven Leuven Belgium
4. Department of Endodontics, Faculty of Dentistry Universitat Internacional de Catalunya Barcelona Spain