- Correspondence to Catherine L Jo, Department of Health Behavior, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 308 Rosenau Hall, CB 7440, Chapel Hill, NC 27599, USA;
- Received January 28, 2015
- Revised May 11, 2015
- Accepted June 9, 2015
- First published June 30, 2015.
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