- Correspondence to Dr RRC McEachan, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, Bradford Royal Infirmary, Duckworth Lane, Bradford, BD9 6RJ, UK;
- Received April 22, 2015
- Revised September 8, 2015
- Accepted September 20, 2015
- First published November 11, 2015.
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- Data supplement 1 - Online tables
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