- Correspondence to Dr David F Kallmes, Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 55905, USA;
- Received October 19, 2011
- Revised November 12, 2011
- Accepted November 14, 2011
- First published December 2, 2011.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.