- Correspondence to Dr Stefan Baral, Center for Public Health and Human Rights, Department of Epidemiology, Johns Hopkins School of Public Health, E7146, 615 N Wolfe Street, Baltimore, MD 21205, USA;
- Accepted 9 February 2010
- Published in print 1 August 2010.
- Published online 26 July 2010.
- Published first 21 April 2010.
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