1. Department of Cranio- and Maxillofacial Surgery, Heinrich Heine University of Düsseldorf, Düsseldorf, Germany.
2. Department of Operative and Preventive Dentistry and Endodontics, Heinrich Heine University of Düsseldorf, Düsseldorf, Germany.
3. Institute of Clinical Radiology and Nuclear Medicine, Heinrich Heine University of Düsseldorf, Düsseldorf, Germany.
4. Institute of Transplantation Diagnostics and Cell Therapeutics, Heinrich Heine University of Düsseldorf, Düsseldorf, Germany.