- Correspondence to Dr Alan J Poots, National Institute of Health Research (NIHR) Collaboration for Leadership in Applied Health Research and Care Northwest London (CLAHRC NWL), London SW10 9NH, UK;
- Received February 12, 2015
- Revised April 8, 2015
- Accepted April 30, 2015
- First published June 3, 2015.
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- Data supplement 1 - Online supplement
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