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2005 • 2,849 citations

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1997 • 1,706 citations

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2003 • 476 citations

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2002 • 427 citations

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2005 • 234 citations

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2013 • 234 citations

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2009 • 211 citations

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2002 • 115 citations

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2011 • 92 citations

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2004 • 67 citations

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2011 • 59 citations

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2012 • 46 citations

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2008 • 32 citations

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2014 • 31 citations

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2012 • 31 citations

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2009 • 15 citations

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2011 • 15 citations

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2011 • 13 citations

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2009 • 13 citations

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2014 • 4 citations