1. University Hospital Regensburg, Department of Oral and Maxillofacial Surgery, Regensburg, Germany
2. University Hospital Regensburg, Department of Ophthalmology, Regensburg, Germany
3. Institute of Immunology, University of Heidelberg, Heidelberg, Germany
4. Center for Medical Biotechnology, Department of Oral and Maxillofacial Surgery, University Hospital Regensburg, Regensburg, Germany