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Acknowledgement

Posted by szczepinska on 08 Jan 2014 at 20:10 GMT

The final text of the article were supposed to have had one more important acknowledgement. It is not possible to correct the text anymore, so we are putting our thanks here. We are deeply sorry for this mistake.
Teresa, Wataru, Thomas

We acknowledge Marion Adebiyi, Segun Fatumo and Olugbenga Oluwagbemi for their important contribution to this article by sharing their experience in the organization of the competitions.

No competing interests declared.