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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Maike Ahrens analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Michael Turewicz analyzed the data, wrote the paper, reviewed drafts of the paper.

Katrin Marcus reviewed drafts of the paper.

Helmut E. Meyer reviewed drafts of the paper.

Caroline May reviewed drafts of the paper.

Martin Eisenacher analyzed the data, wrote the paper, reviewed drafts of the paper.

Jörg Rahnenführer analyzed the data, wrote the paper, reviewed drafts of the paper.

Funding

This work was funded by P.U.R.E., a project of Nordrhein-Westfalen, a federal state of Germany, the BMBF project de.NBI, FKZ 031 A 534A, and the Collaborative Research Center SFB 876 Providing Information by Resource-Constrained Analysis, project A3. All responsibilty for the content of this publication is assumed by the authors. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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