- Correspondence to Dr Jennifer A Taylor, Department of Environmental and Occupational Health, Dornsife School of Public Health at Drexel University, 1505 Race Street MS 1034, Philadelphia, PA 19102, USA;
- Received 25 August 2016
- Revised 19 December 2016
- Accepted 18 January 2017
- Published online 14 February 2017.
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