- Correspondence to Dr Robert C Hughes, Department of Bioethics, National Institutes of Health, Clinical Center, 10 Center Drive, Bldg. 10 room 1C118, Bethesda, MD 20892-1156, USA;
- Received August 8, 2011
- Revised February 1, 2012
- Accepted March 27, 2012
- First published May 5, 2012.
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