1. Department of Conservative Dentistry and Periodontology; Medical University of Vienna; Vienna Austria
2. Austrian Cluster for Tissue Regeneration; Vienna Austria
3. Department of Oral Surgery; Medical University of Vienna; Vienna Austria
4. Department of Blood Group Serology and Transfusion Medicine; Medical University of Vienna; Vienna Austria
5. Laboratory of Oral Cell Biology, School of Dental Medicine; University of Bern; Bern Switzerland