- Correspondence to Dr Amy K Ferketich, Division of Epidemiology, The Ohio State University College of Public Health, 1841 Neil Avenue, 310 Cunz Hall, Columbus, OH 43210, USA;
- Received October 24, 2015
- Revised May 16, 2016
- Accepted June 6, 2016
- First published July 25, 2016.
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