1. Department of Oral Biology Medical University of Vienna Vienna Austria
2. Division of Oral Surgery and Orthodontics Department of Dental Medicine and Oral Health Medical University of Graz Graz Austria
3. Austrian Cluster for Tissue Regeneration Vienna Austria
4. Clinic of Reconstructive Dentistry Center of Dental Medicine University of Zurich Zurich Switzerland
5. Department of Conservative Dentistry Faculty of Dentistry University of Chile Santiago Chile
6. Department of Periodontology School of Dental Medicine University of Bern Bern Switzerland