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    06 Dec 2010
    13:47 GMT
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    Access to data Posted by PLOS_ONE_Group on 04 Jan 2008 at 22:56 GMT
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    26 Feb 2008
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    Manuscript now available Posted by swaddell on 26 Feb 2008 at 11:34 GMT
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    04 Jan 2008
    14:48 GMT
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    Referee comments: Referee 2 Posted by PLOS_ONE_Group on 04 Jan 2008 at 14:48 GMT