- Correspondence to James F Thrasher, Department of Health Promotion, Education and Behaviour, 800 Sumter Street, Room 215, Arnold School of Public Health, University of South Carolina, Columbia, SC 29208, USA;
- Received June 12, 2009
- Revised May 24, 2010
- Accepted June 2, 2010
- First published September 24, 2010.
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