- Correspondence to Dr Maria F Gallo, Division of Epidemiology, College of Public Health, The Ohio State University, 324 Cunz Hall, 1841 Neil Avenue Columbus, OH 43210-1351, USA;
- Received December 8, 2014
- Revised November 10, 2015
- Accepted November 14, 2015
- First published December 15, 2015.
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