* Health and Medical News:Pershing Square's $3.3 billion bet on Valeant

Bill Ackman has purchased a $3.3 billion stake in Valeant, making his firm the company's fifth-largest stakeholder.



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via Health and Medical NewsHealth and Medical News Pfizer Inc has already had its takeover overtures rebuffed three times by rival AstraZeneca Plc, but investors in the U.S. drugmaker say it can tolerate a little more rejection before going hostile with the deal. AstraZeneca turned down a sweeten...

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