- Address correspondence and reprint requests to Dongyu Zhang, MSc, MD, Department of Epidemiology, University of North Carolina at Chapel Hill Gillings School of Global Public Health, 170 Rosenau Hall, CB #7400, 135 Dauer Dr, Chapel Hill, NC 27599–7400. E-mail: .
- Received January 13, 2016
- Accepted March 9, 2016
- First published July 1, 2016.
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