Updated information and services, including high-resolution figures, can be found in the onlineversion of this article at: http://www.sciencemag.org/cgi/content/full/324/5934/1557 Supporting Online Material can be found at: http://www.sciencemag.org/cgi/content/full/1176062/DC1 A list of selectedadditional articles on the Science Web sites related to this article can be found at: http://www.sciencemag.org/cgi/content/full/324/5934/1557#related-content This article cites 17 articles, 7 of whichcan be accessed for free: http://www.sciencemag.org/cgi/content/full/324/5934/1557#otherarticles This article has been cited by 17 article(s) on the ISI Web of Science. This article has been cited by9 articles hosted by HighWire Press; see: http://www.sciencemag.org/cgi/content/full/324/5934/1557#otherarticles This article appears in the following subject collections: Epidemiologyhttp://www.sciencemag.org/cgi/collection/epidemiology Information about obtaining reprints of this article or about obtaining permission to reproduce this article in whole or in part can be found at:http://www.sciencemag.org/about/permissions.dtl Downloaded from www.sciencemag.org on September 17, 2009
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