- Correspondence to Bert Brunekreef, Division of Environmental Epidemiology, Institute for Risk Assessment Sciences (IRAS), Utrecht University, P.O. Box 80178, 3508 TD, Utrecht, The Netherlands;
- Received June 17, 2012
- Revised January 10, 2013
- Accepted January 17, 2013
- First published February 21, 2013.
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