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"AbbVie has relied on Humira for rheumatoid arthritis for years, but with its patent expiring within three years, AbbVie will have to find answers to go up against the longer-lived patent protection that Amgen and Pfizer enjoy."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.fool.com/investing/general/2013/10/24/can-abbvie-hold-off-amgen-and-pfizer.aspx>