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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Martin Hůla conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Jaroslav Flegr conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Human Ethics

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

1) IRB of the Charles University, Faculty of Science

2) approval number: 2015/31

Data Deposition

The following information was supplied regarding data availability:

1) figshare

2) 10.6084/m9.figshare.2082529

3) https://figshare.com/s/7306f12659f68f7f3d9d

Funding

The research was supported by the Grant Agency of the Charles University in Prague (project n°: 338315). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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