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Additional Information

Competing Interests

The authors declare no conflict of interest.

Author Contributions

Rebeka Marothi performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Szabolcs Keri conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Human Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

Institutional Review Board of University of Szeged approved the study (2697/2010). All participants gave written informed consent.


The study received no external funding.

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