- Correspondence to Dr Karen Shaw, School of Health and Population Sciences, College of Medical and Dental Sciences, University of Birmingham, 52 Pritchatts Road, Edgbaston, Birmingham B15 2TT, UK;
- Received November 13, 2012
- Revision received October 17, 2013
- Accepted December 17, 2013
- First published March 4, 2014.
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