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Mar 2013 - Present (11 years 9 months)
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Jun 2012 - Present (12 years 6 months)
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Sep 2012 - Feb 2013 (5 months)
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Jan 2010 - Sep 2012 (2 years 8 months)
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Jul 2007 - Apr 2009 (1 year 9 months)
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Oct 2007 - Jan 2009 (1 year 3 months)
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Dec 2006 - Aug 2007 (8 months)