- Correspondence to Dr Shelley D Golden, Department of Health Behavior, Gillings School of Global Public Health, University of North Carolina, 364 Rosenau Hall, CB7440, Chapel Hill, NC 27599, UK;
- Received February 19, 2015
- Revised June 15, 2015
- Accepted July 2, 2015
- First published September 21, 2015.
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- Data supplement 1 - Online supplement
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