- 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 12 February 2015
- Revised 8 April 2015
- Accepted 30 April 2015
- Published online 3 June 2015.
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- Data supplement 1 - Online supplement
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