- Correspondence to Dr Alexander L Coon, Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, 600 North Wolfe Street, Meyer 8-181, Baltimore, MD 21287, USA;
- Received February 5, 2012
- Revised March 5, 2012
- Accepted March 7, 2012
- First published March 29, 2012.
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