- 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 8 August 2011
- Revised 1 February 2012
- Accepted 27 March 2012
- Published online 5 May 2012.
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