- Correspondence to Dr Patrick N Breysse, Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health, 615N. Wolfe St, Baltimore, Maryland 21205, USA;
- Received 2 November 2011
- Accepted 29 July 2012
- Published in print 1 May 2013.
- Published online 15 April 2013.
- Published first 4 September 2012.
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