They note that it hits only one unproven mechanism behind stroke and that it may be necessary to hit multiple biological pathways to get a significant effect.
Fellow Englishmen John Bickerton and David Griffiths are among a group of five players a stroke behind.
Newcastle started to contain their rivals as they worked their way into the game before they went behind on the stroke of half-time.
One stroke behind Woods and Briton Rose is a quartet of Americans -- Bo van Pelt, Steve Stricker, Matt Kuchar and Scott Piercy.
Michael Krensavage at Raymond James, who has been bearish about Merck, notes that the data behind using Cozaar for stroke were published already.
Liver disease, the fifth biggest cause of death in England and Wales behind heart disease, cancer, stroke and respiratory disease, comes in more than 100 forms but is most commonly associated with alcohol abuse, obesity and viral hepatitis.
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The dismissal seemed to unnerve Clarke and he was out shortly after when he played a loose stroke against Steyn and was caught behind, just before tea.
But Woods dropped the ball two yards behind the first spot where he played the prior stroke.
But Owen, playing behind Viduka and Martins, got his reward on the stroke of half-time.
Jason Day had the second-round lead, Marc Leishman was a stroke back, and Adam Scott was three shots behind.
Driscoll was 18 shots behind leader Charley Hoffman, who will take a two-stroke advantage over 2012 U.S. Open champion Webb Simpson into Sunday's final round.
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