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Division of Epidemiology, School of Public Health, University of Minnesota, Minneapolis, Minnesota
Received 21 May 2010; received in revised form 5 June 2010; accepted 5 June 2010. published online 01 September 2010.
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PII: S0002-9149(10)01225-7
doi:10.1016/j.amjcard.2010.06.036