1. Department of Orthopaedic and Trauma Surgery; University Hospital Essen; University of Duisburg-Essen; Essen Germany
2. Department of Pediatrics III; West German Cancer Centre; German Cancer Research Centre; University Hospital Essen; University of Duisburg-Essen; Essen Germany
3. Particle Therapy Clinic at West German Proton Therapy Centre Essen; University Hospital; University of Duisburg-Essen; Essen Germany
4. Department of Pediatric Hematology and Oncology; Muenster Germany
5. Oral and Maxillofacial Surgery Clinics; University Hospital Muenster; Muenster Germany
6. Department of Cardiothoracic Surgery; University Hospital Muenster; Muenster Germany
7. Department Osnabrueck; Center for Radiotherapy Rheine-Osnabrueck; Osnabrueck Germany
8. Department of Radiotherapy and Radiation Oncology; Klinikum Ingolstadt; Ingolstadt Germany
9. Department of Clinical Radiology; Klinikum Ibbenbüren; Ibbenbüren Germany
10. Department of Tumor Orthopedics and Sarcoma Surgery; University Hospital Essen; University of Duisburg-Essen; Essen Germany
11. Department of Internal Medicine; University Medical Center Hamburg-Eppendorf; Hamburg Germany