- Correspondence to Dr Renee D Goodwin, Department of Epidemiology and Biostatistics, Graduate School of Public Health and Health Policy, City University of New York, 55 West 125th Street, New York, New York 10027, USA;
- Received December 20, 2016
- Revised June 22, 2017
- Accepted July 6, 2017
- First published August 10, 2017.
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