- 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 21 September 2015
- Revised 11 July 2016
- Accepted 24 July 2016
- Published online 14 December 2016.
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