1. Clinic of Diagnostic and Interventional Radiology, Saarland University Hospital, Kirrberger Strasse Geb. 50.1, 66424 Homburg, Germany.
2. Punkt05 Statistical Consulting, Düsseldorf, Germany.
3. Siemens Healthineers Ultrasound Division, Issaquah, WA.
4. Department of Medical Physics, University of Wisconsin, Madison, WI.