1. Department of Experimental Radiology, Institute of Diagnostic and Interventional Radiology, Jena University Hospital, Friedrich Schiller University Jena, Am Klinikum 1, 07747 Jena, Germany
2. Resonant Circuits Limited, 21 Albemarle Street, London W1S 4BS, UK
3. Healthcare Biomagnetics Laboratory, University College London, 21 Albemarle St., London W1S 4BS, UK
4. Center for Electron Microscopy, Jena University Hospital, Friedrich Schiller University Jena, Ziegelmuehlenweg 1, 07743 Jena, Germany