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Referee Comments: Referee 2

Posted by PLOS_ONE_Group on 31 Mar 2008 at 18:09 GMT

Referee 2's Review:

This is an original, significant, sound, and scholarly piece of work. Normally I can find at least a few minor points that need to be addressed in a revision but here I cannot. I recommend publishing this paper essentially as is.

N.B. These are the comments made by the referee when reviewing an earlier version of this paper. Prior to publication the manuscript has been revised in light of these comments and to address other editorial requirements.