Table 1b is not displayed correctly in the published article. Please see the correct Table 1 here:
. 2008 May 19;4(5):10.1371/annotation/ff93eba8-9567-4f41-b90d-9cdfdf65f747. doi: 10.1371/annotation/ff93eba8-9567-4f41-b90d-9cdfdf65f747
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