- Correspondence to Dr Colin P Derdeyn, Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S. Kingshighway Blvd, St Louis 63110, Missouri, USA;
- Received May 17, 2011
- Revised August 19, 2011
- Accepted August 30, 2011
- First published September 27, 2011.
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