- Correspondence to Dr Nir Eyal, Program in Ethics and Health, Harvard University, Boston, MA 02139, USA;
- Received 2 January 2012
- Revised 16 July 2012
- Accepted 1 November 2012
- Published in print 1 July 2014.
- Published online 17 June 2014.
- Published first 8 December 2012.
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