- Correspondence to Dr Noel T Brewer, Department of Health Behavior, Gillings School of Global Public Health, University of North Carolina, 325 Rosenau Hall CB7440, Chapel Hill, NC 27599, USA;
- Received December 23, 2015
- Revised September 11, 2016
- Accepted September 23, 2016
- First published December 6, 2016.
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