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nature impact factor 2004
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nature impact factor 2000
nature impact factor 2001
nature impact factor 2003
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nature impact factor 2005, nature impact factor 2004, nature impact factor 2006, nature impact factor 2002, nature impact factor 2008, nature impact factor 2000, nature impact factor 2001, nature impact factor 2003, nature impact factor 2007, nature impact factor 2009
