- Correspondence to Dr Natalie V Schwatka, Center for Health, Work and Environment, Colorado School of Public Health, 13001 E. 17th Place, 3rd Floor, Mail Stop B-119, Aurora, CO 80045, USA;
- Received September 21, 2015
- Revised July 11, 2016
- Accepted July 24, 2016
- First published August 16, 2016.
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