- Correspondence to: Dr A Zanobetti Department of Environmental Health, Exposure Epidemiology and Risk Program, Harvard School of Public Health, 401 Park Drive, Landmark Center, Suite 415, PO Box 15698, Boston, MA 02215, USA;
- Accepted 7 March 2006
- Published in print 1 October 2006.
- Published online 13 September 2006.
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