- Correspondence to Dr Mark H Ebell, Department of Epidemiology and Biostatistics, College of Public Health, University of Georgia, 125 Miller Hall, UGA Health Sciences Campus, Athens, GA 30602, USA;
- Accepted 2 May 2017
- Published in print 1 June 2017.
- Published online 9 June 2017.
- Published first 29 May 2017.
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