1. Clinic for Trauma and Reconstructive Surgery, University Clinic Heidelberg, 69118 Heidelberg, Germany
2. Group Practice of Physicians Spilburg Wetzlar, Department of Orthopedics, 35578 Wetzlar, Germany
3. Rudolf Frey Learning Clinic, University Medical Centre of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany
4. Department for Orthopaedics and Trauma Surgery, University Medical Centre Mannheim, 68167 Mannheim, Germany
5. Department of Diagnostic and Interventional Radiology, University Medical Centre of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany
6. BIKUS—Brandenburg Institute for Clinical Ultrasound, Brandenburg Medical School Theodor Fontane (MHB), 16816 Neuruppin, Germany
7. Department of Obstetrics and Prenatal Medicine, University Hospital Bonn, 53127 Bonn, Germany
8. Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Regensburg, 93053 Regensburg, Germany
9. Institute of Interventional Radiology, University Hospital Schleswig-Holstein—Campus Lübeck, 23538 Luebeck, Germany