- Correspondence to: MsC C Denny Department of Clinical Bioethics, National Institutes of Health, 10 Center Drive, 10/1C118, Bethesda, MD 20892-1156, USA;
- Received June 1, 2006
- Accepted July 24, 2006
- Revised July 21, 2006
- First published June 29, 2007.
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