- Correspondence to: Friedhelm Hildebrandt MD, University of Michigan Medical School, 8220C MSRB III, 1150 West Medical Center Drive, Ann Arbor, MI 48109-0646, USA;
- Received May 27, 2007
- Accepted June 20, 2007
- Revised June 19, 2007
- First published July 6, 2007.
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