- Correspondence to Dr Linda H Aiken, University of Pennsylvania School of Nursing, Center for Health Outcomes and Policy Research, 418 Curie Boulevard, Philadelphia, PA 19104, USA;
- Received 7 April 2016
- Revised 4 October 2016
- Accepted 8 October 2016
- Published in print 1 July 2017.
- Published online 16 June 2017.
- Published first 15 November 2016.
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