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Posted by plosmedicine on 31 Mar 2009 at 00:32 GMT

Author: Nisha Doshi
Position: Publications Assistant
Institution: PLoS Medicine
Submitted Date: November 25, 2008
Published Date: November 25, 2008
This comment was originally posted as a “Reader Response” on the publication date indicated above. All Reader Responses are now available as comments.

Please note that there is a correction to the results section in the Research Article on which this Perspective is based. Details of this correction can be found at http://medicine.plosjourn... and a formal correction is forthcoming.

No competing interests declared.