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Change of author contributions.

Posted by zappafrank22 on 21 Dec 2012 at 01:33 GMT

Please note, lead author Mostafa Elfawal (MAE) should properly be listed as follows:
Contributed reagents/materials/analysis tools: MAE PJW MJT NGR SMR.
Wrote the paper: MAE MJT PJW NGR SMR.

"MAE" was mistakenly omitted from both lists of contributors.

No competing interests declared.