- 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 20 December 2016
- Revised 22 June 2017
- Accepted 6 July 2017
- Published in print 11 August 2017.
- Published online 10 August 2017.
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