1. BIKUS—Brandenburg Institute for Clinical Ultrasound, Brandenburg Medical School Theodor Fontane (MHB), 16816 Neuruppin, Germany
2. Immanuel Klinik Rüdersdorf, University Hospital of the Brandenburg Medical School, 15562 Rüdersdorf bei Berlin, Germany
3. Department of Internal Medicine I, Hospital of the German Armed Forces Berlin, 10115 Berlin, Germany
4. Center of Orthopedics, Trauma Surgery and Spinal Cord Injury, Heidelberg University Hospital Heidelberg, 69118 Heidelberg, Germany
5. Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Regensburg, 93053 Regensburg, Germany
6. Institute of Interventional Radiology, University Hospital Schleswig-Holstein—Campus Lübeck, 23538 Lübeck, Germany
7. Rudolf Frey Learning Clinic, University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany