- Correspondence to Professor Jill Maben, Florence Nightingale Faculty of Nursing and Midwifery, King's College London, London SE1 8WA, UK;
- Received April 1, 2015
- Revised August 4, 2015
- Accepted August 18, 2015
- First published September 25, 2015.
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- Data supplement 1 - Online supplement
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