1. Department for Functional Materials in Medicine and Dentistry and Bavarian Polymer InstituteUniversity of Würzburg Pleicherwall 2 97070 Würzburg Germany
2. Department of Oral and Maxillofacial Surgery and Special Dental CareUniversity Medical Center UtrechtRegenerative Medicine UtrechtUtrecht University Heidelberglaan 100 3508 GA Utrecht The Netherlands