1. Medius Klinik Ostfildern-Ruit; Craniofacial and Plastic Surgery; Ostfildern-Ruit Germany 73760
2. Klinikum Stuttgart - Katharinenhospital; Head Center - Clinic for Maxillofacial Surgery, Plastic Surgery, Implant Center; Stuttgart Germany
3. University Hospital of Duesseldorf; Department of Oral and Maxillofacial Surgery, Plastic Surgery of the Face; Moorenstr. 5 Duesseldorf Germany D-40225
4. University Hospital Basel; Cranio-Maxillofacial Surgery; Basel Switzerland
5. University Hospital Basel and University of Basel; Basel Institute for Clinical Epidemiology and Biostatistics, Department of Clinical Research; Basel Switzerland
6. Columbia University Medical Center; Division of Oral and Maxillofacial Radiology; New York NY USA