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Posted by vcojocaru on 23 Aug 2011 at 12:28 GMT

Dear readers,

I would like to encourage you to comment and rate this article. This is a feature of the PLoS journals that may be very useful both for authors and for readers.

We, the authors may get useful feed-back on our research while you may profit from our comments and answers to your queries.

Have a pleasant reading,
Vlad

No competing interests declared.