1. Institute of Diagnostic and Interventional Radiology/Neuroradiology, Westküstenklinikum Heide, Academic Teaching Hospital of the Universities of Kiel, Lübeck and Hamburg, 25746 Heide, Germany
2. Conradia Radiologische Praxen, 21029 Hamburg, Germany
3. InnoMed, LLC, Lake Tahoe, Stateline, NV 89449-4470, USA