- Correspondence to Jane E Ball, National Nursing Research Unit, Florence Nightingale School of Nursing and Midwifery, James Clerk Maxwell Building, 57 Waterloo Road, London SE1 8WA, UK;
- Received December 18, 2012
- Revised June 3, 2013
- Accepted June 6, 2013
- First published July 29, 2013.
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