- Correspondence to Professor Adrian R Martineau, Centre for Primary Care and Public Health, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, 58 Turner Street, London E1 2AB, UK;
- Received March 3, 2015
- Revised May 18, 2015
- Accepted May 26, 2015
- First published June 10, 2015.
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- Data supplement 1 - Online supplement
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