- Correspondence to Katie Byron, Department of Bioethics, Clinical Center, National Institutes of Health, 10 Center Drive, Bldg. 10, Room 1C118, Bethesda, MD 20892-0001, USA;
- Received 3 August 2016
- Revised 13 September 2016
- Accepted 12 November 2016
- Published online 25 April 2017.
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