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J Phys Act Health 2013 Sep 5;10(7):1032-8. Epub 2012 Nov 5.
Dept of Public Health, East Carolina University, Greenville, NC.
Am J Health Promot 2011 Sep-Oct;26(1):52-5
Department of Public Health, Brody School of Medicine, East Carolina University, Greenville, North Carolina 27834, USA.