- Correspondence to Dr Salma Ahmed Ayis, Division of Health and Social Care Research, Department of Primary Care and Public Health Sciences, King's College London, 5th floor, Capital House, 42 Weston Street, London SE1 3QD, UK;
- Received June 22, 2012
- Revised December 18, 2012
- Accepted December 27, 2012
- First published February 5, 2013.
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